FPUS53 KLSX 182318 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 618 PM CDT Mon May 18 2026 ILZ100-101-MOZ061-063-064-190700- Madison IL-Saint Clair IL-Saint Charles MO-Saint Louis MO- Saint Louis City MO- Including the cities of Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Mostly cloudy. Showers and thunderstorms likely this evening, then a chance of showers with a slight chance of thunderstorms after midnight. Some thunderstorms may produce heavy rainfall this evening. Some thunderstorms may produce heavy rainfall after midnight. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY...Mostly cloudy. A chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Some thunderstorms may produce heavy rainfall. Highs in the lower 80s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Showers likely. Thunderstorms likely, mainly in the evening. Lows in the mid 50s. North winds 5 to 10 mph. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy with a 20 percent chance of showers. Cooler with highs in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the lower 50s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the upper 50s. Chance of rain 60 percent. .FRIDAY...Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows around 60. Chance of rain 50 percent. .SATURDAY...Mostly cloudy with a slight chance of showers in the morning, then partly sunny with a chance of showers with a slight chance of thunderstorms in the afternoon. Highs around 80. Chance of rain 40 percent. .SATURDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Lows in the lower 60s. Chance of rain 20 percent. .SUNDAY...Partly sunny with a chance of showers with a slight chance of thunderstorms. Highs in the lower 80s. Chance of rain 40 percent. .SUNDAY NIGHT...Mostly cloudy with a 40 percent chance of showers. Lows in the mid 60s. .MEMORIAL DAY...Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. $$ MOZ042-049-050-190700- Audrain MO-Osage MO-Callaway MO- Including the cities of Mexico and Fulton 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Partly cloudy this evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers this evening, then showers after midnight. Some thunderstorms may produce heavy rainfall. Locally heavy rainfall possible. Lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent. .TUESDAY...Cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Some thunderstorms may produce heavy rainfall. Highs in the mid 70s. Temperature falling into the upper 60s in the afternoon. South winds 10 to 15 mph, becoming northwest in the afternoon. Chance of rain 70 percent. .TUESDAY NIGHT...A chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Cooler. Less humid with lows in the lower 50s. North winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50 percent. .WEDNESDAY...Partly sunny with a 20 percent chance of showers. Highs in the mid 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly cloudy. Highs around 70. .THURSDAY NIGHT...Mostly cloudy. A chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 70 percent. .FRIDAY...Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the mid 50s. Chance of rain 50 percent. .SATURDAY AND SATURDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms. Highs in the upper 70s. Lows in the upper 50s. Chance of rain 20 percent. .SUNDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 30 percent. .SUNDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Lows in the lower 60s. Chance of rain 20 percent. .MEMORIAL DAY...Partly sunny. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. $$ MOZ041-047-048-190700- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Partly cloudy with a slight chance of showers and thunderstorms this evening, then mostly cloudy with showers with a chance of thunderstorms after midnight. Some thunderstorms may produce heavy rainfall. Locally heavy rainfall possible after midnight. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 90 percent. .TUESDAY...Cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Some thunderstorms may produce heavy rainfall. Highs in the lower 70s. Temperature falling into the mid 60s in the afternoon. South winds 5 to 10 mph, becoming northwest in the afternoon. Gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Cooler. Less humid with lows in the lower 50s. North winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50 percent. .WEDNESDAY...Partly sunny. A slight chance of showers in the morning. Highs in the upper 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the lower 50s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly cloudy. A slight chance of showers in the afternoon. Highs in the lower 70s. Chance of rain 20 percent. .THURSDAY NIGHT...Mostly cloudy. A chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 70 percent. .FRIDAY...Showers likely with a chance of thunderstorms. Highs in the mid 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY AND SATURDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms. Highs around 80. Lows in the upper 50s. Chance of rain 20 percent. .SUNDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 30 percent. .SUNDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Lows in the lower 60s. Chance of rain 20 percent. .MEMORIAL DAY...Partly sunny. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. $$ ILZ095>097-MOZ018-019-026-027-190700- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Including the cities of Quincy, Mount Sterling, Pittsfield, and Hannibal 618 PM CDT Mon May 18 2026 .TONIGHT...Mostly cloudy with a chance of thunderstorms. A chance of showers this evening, then showers after midnight. Locally heavy rainfall possible this evening. Near steady temperature in the upper 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent. .TUESDAY...Cloudy with a slight chance of thunderstorms. Showers likely, mainly in the morning. Highs in the lower 70s. Temperature falling into the mid 60s in the afternoon. Southwest winds 10 to 15 mph, becoming northwest in the afternoon. Gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Much cooler. Less humid with lows around 50. North winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY...Mostly sunny. Highs in the mid 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows in the upper 40s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs around 70. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the lower 50s. Chance of rain 50 percent. .FRIDAY...Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the upper 60s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows in the mid 50s. Chance of rain 50 percent. .SATURDAY THROUGH SUNDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Highs around 80. Lows in the upper 50s. Chance of rain 20 percent. .MEMORIAL DAY...Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ034>036-190700- Monroe MO-Ralls MO-Pike MO- Including the city of Bowling Green 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Partly cloudy with a slight chance of showers and thunderstorms this evening, then cloudy with showers with a chance of thunderstorms after midnight. Some thunderstorms may produce heavy rainfall. Lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent. .TUESDAY...Cloudy. Showers likely with a chance of thunderstorms in the morning, then a slight chance of showers and thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall. Highs in the mid 70s. Temperature falling into the mid 60s in the afternoon. South winds 10 to 15 mph, becoming northwest in the afternoon. Gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Cooler. Less humid with lows in the lower 50s. North winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. .WEDNESDAY...Partly sunny. Highs in the mid 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. Lows in the upper 40s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs around 70. .THURSDAY NIGHT...Mostly cloudy. A chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 60 percent. .FRIDAY...Showers likely with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 60s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the mid 50s. Chance of rain 50 percent. .SATURDAY THROUGH SUNDAY...Mostly cloudy with a slight chance of showers and thunderstorms. Highs around 80. Lows in the upper 50s. Chance of rain 20 percent. .SUNDAY NIGHT AND MEMORIAL DAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. Highs in the mid 80s. Chance of rain 30 percent. $$ ILZ069-070-074-190700- Clinton IL-Marion IL-Washington IL- Including the cities of Centralia and Salem 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Mostly cloudy with showers and thunderstorms likely this evening, then partly cloudy after midnight. Some thunderstorms may produce heavy rainfall this evening. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY...Partly sunny with a chance of showers with a slight chance of thunderstorms in the morning, then mostly cloudy with showers and thunderstorms likely in the afternoon. Some thunderstorms may produce heavy rainfall. Highs in the lower 80s. Southwest winds 15 to 20 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Showers likely. Thunderstorms likely, mainly in the evening. Lows in the upper 50s. West winds 5 to 10 mph, becoming north after midnight. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy. A chance of showers, mainly in the morning. Cooler with highs in the upper 60s. North winds 5 to 10 mph. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the lower 50s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. Showers likely with a slight chance of thunderstorms after midnight. Lows in the upper 50s. Chance of rain 60 percent. .FRIDAY...Showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 80 percent. .FRIDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the lower 60s. Chance of rain 50 percent. .SATURDAY...Mostly cloudy with a slight chance of showers in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs around 80. Chance of rain 40 percent. .SATURDAY NIGHT AND SUNDAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. Highs in the lower 80s. Chance of rain 40 percent. .SUNDAY NIGHT...Mostly cloudy with a 40 percent chance of showers. Lows in the mid 60s. .MEMORIAL DAY...Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. $$ MOZ074-084-085-099-190700- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 618 PM CDT Mon May 18 2026 .TONIGHT...Mostly cloudy. A chance of showers and thunderstorms this evening. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent. .TUESDAY...Mostly cloudy. A chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs in the lower 80s. Southwest winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Showers. Thunderstorms likely, mainly in the evening. Cooler with lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain 90 percent. .WEDNESDAY...Mostly cloudy. A chance of showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Cooler with highs in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy with a 20 percent chance of showers. Lows in the lower 50s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly cloudy with a 20 percent chance of showers. Highs in the mid 70s. .THURSDAY NIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the evening, then showers likely with a chance of thunderstorms after midnight. Lows in the upper 50s. Chance of rain 70 percent. .FRIDAY...Showers likely with a slight chance of thunderstorms in the morning, then showers with a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 80 percent. .FRIDAY NIGHT AND SATURDAY...Mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 50s. Highs in the lower 80s. Chance of rain 50 percent. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. Highs in the lower 80s. Chance of rain 50 percent. .MEMORIAL DAY...Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent. $$ MOZ051-052-060-190700- Montgomery MO-Lincoln MO-Warren MO- 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Partly cloudy this evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers this evening, then showers after midnight. Some thunderstorms may produce heavy rainfall. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 90 percent. .TUESDAY...Cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Some thunderstorms may produce heavy rainfall. Highs in the upper 70s. Temperature falling to around 70 in the afternoon. South winds 10 to 15 mph, becoming west in the afternoon. Chance of rain 70 percent. .TUESDAY NIGHT...A chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Cooler. Less humid with lows in the lower 50s. North winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50 percent. .WEDNESDAY...Partly sunny with a slight chance of showers in the morning, then mostly cloudy in the afternoon. Cooler with highs in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. Northeast winds around 5 mph. .THURSDAY...Partly sunny. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 60 percent. .FRIDAY...Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the mid 50s. Chance of rain 50 percent. .SATURDAY...Mostly cloudy with a slight chance of showers in the morning, then partly sunny with a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 40 percent. .SATURDAY NIGHT AND SUNDAY...Mostly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 50s. Highs in the lower 80s. Chance of rain 20 percent. .SUNDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the lower 60s. Chance of rain 30 percent. .MEMORIAL DAY...Partly sunny. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. $$ ILZ098-099-190700- Calhoun IL-Jersey IL- 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Mostly cloudy with a chance of thunderstorms. A chance of showers this evening, then showers likely after midnight. Some thunderstorms may produce heavy rainfall. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY...Cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Some thunderstorms may produce heavy rainfall. Highs in the upper 70s. South winds 10 to 15 mph, becoming west in the afternoon. Chance of rain 70 percent. .TUESDAY NIGHT...Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Cooler. Less humid with lows in the mid 50s. North winds 5 to 10 mph. Chance of rain 50 percent. .WEDNESDAY...Partly sunny in the morning, then becoming mostly cloudy. Cooler with highs in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 50 percent. .FRIDAY...Showers likely with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY AND SATURDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the upper 70s. Lows in the upper 50s. Chance of rain 30 percent. .SUNDAY...Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent. .SUNDAY NIGHT AND MEMORIAL DAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. Highs in the mid 80s. Chance of rain 30 percent. $$ ILZ058-059-190700- Greene IL-Macoupin IL- 618 PM CDT Mon May 18 2026 .TONIGHT...Mostly cloudy with a chance of showers and thunderstorms. Lows in the lower 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent. .TUESDAY...Cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Highs in the upper 70s. Temperature falling into the lower 70s in the afternoon. South winds 15 to 20 mph, becoming west 10 to 15 mph in the afternoon. Chance of rain 70 percent. .TUESDAY NIGHT...Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Cooler. Less humid with lows in the lower 50s. North winds 5 to 10 mph. Chance of rain 50 percent. .WEDNESDAY...Partly sunny. Cooler with highs in the upper 60s. North winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the mid 40s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs around 70. .THURSDAY NIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 50s. Chance of rain 50 percent. .FRIDAY...Showers likely with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows in the mid 50s. Chance of rain 50 percent. .SATURDAY AND SATURDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the upper 70s. Lows in the upper 50s. Chance of rain 30 percent. .SUNDAY...Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent. .SUNDAY NIGHT AND MEMORIAL DAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows around 60. Highs in the mid 80s. Chance of rain 30 percent. $$ ILZ064-065-190700- Bond IL-Fayette IL- Including the city of Vandalia 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Mostly cloudy. Showers and thunderstorms likely this evening, then a chance of showers with a slight chance of thunderstorms after midnight. Some thunderstorms may produce heavy rainfall this evening. Some thunderstorms may produce heavy rainfall after midnight. Near steady temperature in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Some thunderstorms may produce heavy rainfall. Highs in the lower 80s. Southwest winds 15 to 20 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Showers likely. Thunderstorms likely, mainly in the evening. Lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy. A slight chance of showers in the morning. Cooler with highs in the upper 60s. North winds around 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs around 70. .THURSDAY NIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 50 percent. .FRIDAY...Showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 80 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows around 60. Chance of rain 50 percent. .SATURDAY...Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 30 percent. .SATURDAY NIGHT AND SUNDAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows around 60. Highs in the lower 80s. Chance of rain 30 percent. .SUNDAY NIGHT...Mostly cloudy. A chance of showers, mainly in the evening. Lows in the lower 60s. Chance of rain 30 percent. .MEMORIAL DAY...Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 40 percent. $$ ILZ060-190700- Montgomery IL- Including the city of Litchfield 618 PM CDT Mon May 18 2026 .TONIGHT...Mostly cloudy. Showers likely with a chance of thunderstorms this evening, then a chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 60s. South winds around 15 mph with gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs around 80. Temperature falling into the mid 70s in the afternoon. Southwest winds 15 to 20 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Cloudy. Showers and thunderstorms likely in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Northwest winds 5 to 10 mph. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy in the morning, then becoming partly sunny. Cooler with highs in the upper 60s. North winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the mid 40s. Northeast winds 5 to 10 mph. .THURSDAY...Partly sunny. Highs around 70. .THURSDAY NIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 50s. Chance of rain 50 percent. .FRIDAY...Showers likely with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY THROUGH SUNDAY...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the upper 70s. Lows in the upper 50s. Chance of rain 30 percent. .SUNDAY NIGHT...Mostly cloudy with a 20 percent chance of showers. Lows in the lower 60s. .MEMORIAL DAY...Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 30 percent. $$ ILZ079-MOZ075-190700- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 618 PM CDT Mon May 18 2026 .TONIGHT...Mostly cloudy with showers and thunderstorms likely this evening, then partly cloudy after midnight. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs in the mid 80s. Southwest winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Showers likely. Thunderstorms likely, mainly in the evening. Lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy. A chance of showers, mainly in the morning. Much cooler with highs in the upper 60s. North winds 5 to 10 mph. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the lower 50s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly cloudy in the morning, then partly sunny with a slight chance of showers in the afternoon. Highs in the lower 70s. Chance of rain 20 percent. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then showers likely with a chance of thunderstorms after midnight. Lows in the upper 50s. Chance of rain 70 percent. .FRIDAY...Showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 80 percent. .FRIDAY NIGHT AND SATURDAY...Mostly cloudy. A chance of showers and thunderstorms. Lows around 60. Highs in the lower 80s. Chance of rain 50 percent. .SATURDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms in the evening. A chance of showers. Lows around 60. Chance of rain 50 percent. .SUNDAY...Partly sunny with a chance of showers with a slight chance of thunderstorms. Highs in the lower 80s. Chance of rain 40 percent. .SUNDAY NIGHT...Mostly cloudy with a 40 percent chance of showers. Lows in the lower 60s. .MEMORIAL DAY...Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent. $$ MOZ059-062-072-073-190700- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Mostly cloudy. Showers and thunderstorms likely, mainly this evening. Some thunderstorms may produce heavy rainfall this evening. Some thunderstorms may produce heavy rainfall after midnight. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY...Cloudy. A chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Some thunderstorms may produce heavy rainfall. Highs around 80. Southwest winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Showers likely. Thunderstorms likely, mainly in the evening. Cooler with lows in the mid 50s. North winds around 5 mph. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy with a 50 percent chance of showers. Cooler with highs in the upper 60s. Northeast winds around 5 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows around 50. Northeast winds around 5 mph. .THURSDAY...Mostly cloudy. A slight chance of showers in the afternoon. Highs in the lower 70s. Chance of rain 20 percent. .THURSDAY NIGHT...Mostly cloudy. A chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 70 percent. .FRIDAY...Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY THROUGH SUNDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the lower 80s. Lows around 60. Chance of rain 50 percent. .MEMORIAL DAY...Partly sunny. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. $$ ILZ102-MOZ065-190700- Monroe IL-Jefferson MO- 618 PM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...Mostly cloudy with showers and thunderstorms likely this evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Some thunderstorms may produce heavy rainfall this evening. Some thunderstorms may produce heavy rainfall after midnight. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY...Mostly cloudy. A chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Some thunderstorms may produce heavy rainfall. Highs in the lower 80s. Southwest winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 70 percent. .TUESDAY NIGHT...Showers likely. Thunderstorms likely, mainly in the evening. Cooler with lows in the mid 50s. Northwest winds 5 to 10 mph. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy. A chance of showers, mainly in the morning. Cooler with highs in the upper 60s. North winds 5 to 10 mph. Chance of rain 30 percent. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the lower 50s. Northeast winds around 5 mph. .THURSDAY...Mostly cloudy in the morning, then partly sunny with a slight chance of showers in the afternoon. Highs in the lower 70s. Chance of rain 20 percent. .THURSDAY NIGHT AND FRIDAY...Showers likely with a chance of thunderstorms. Lows in the mid 50s. Highs in the mid 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY THROUGH SUNDAY...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the lower 80s. Lows around 60. Chance of rain 40 percent. .SUNDAY NIGHT...Mostly cloudy with a 40 percent chance of showers. Lows in the lower 60s. .MEMORIAL DAY...Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. $$