FPUS53 KLSX 181628 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 1127 AM CDT Mon May 18 2026 ILZ100-101-MOZ061-063-064-190000- 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 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Showers. A chance of thunderstorms early, then thunderstorms likely. Some thunderstorms may produce heavy rainfall early. Some thunderstorms may produce heavy rainfall. Cooler. Near steady temperature in the mid 70s. Southwest winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TONIGHT...Mostly cloudy. Showers and thunderstorms likely, mainly in the evening. Some thunderstorms may produce heavy rainfall in the evening. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 60 percent. .TUESDAY...Showers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the mid 80s. Temperature falling to around 80 in the afternoon. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain near 100 percent. .TUESDAY NIGHT...Showers with a chance of thunderstorms in the evening, then showers likely after midnight. Cooler with lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain near 100 percent. .WEDNESDAY...Mostly cloudy. Much cooler with highs in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. Lows in the lower 50s. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A chance of showers after midnight. Lows in the upper 50s. Chance of rain 40 percent. .FRIDAY...Mostly cloudy with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 50 percent. .FRIDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows around 60. Chance of rain 50 percent. .SATURDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the lower 80s. Chance of rain 40 percent. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows in the lower 60s. Highs in the mid 80s. $$ MOZ049-050-190000- Osage MO-Callaway MO- Including the city of Fulton 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Showers. A chance of thunderstorms early, then thunderstorms likely. Some thunderstorms may produce heavy rainfall early. Some thunderstorms may produce heavy rainfall. Locally heavy rainfall possible. Cooler. Near steady temperature in the lower 70s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 90 percent. .TONIGHT...Mostly cloudy. A chance of showers and thunderstorms. Some thunderstorms may produce heavy rainfall in the evening. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent. .TUESDAY...A chance of thunderstorms. Showers. Highs in the upper 70s. Temperature falling into the lower 70s in the afternoon. Southwest winds 10 to 15 mph, becoming northwest in the afternoon. Chance of rain near 100 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. Cooler with highs in the upper 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. .THURSDAY...Partly sunny. A slight chance of showers and thunderstorms 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 a chance of showers after midnight. Lows in the mid 50s. Chance of rain 40 percent. .FRIDAY...Mostly cloudy with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 50 percent. .FRIDAY NIGHT AND SATURDAY...Mostly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 50s. Highs in the lower 80s. Chance of rain 20 percent. .SATURDAY NIGHT...Partly cloudy. Lows in the upper 50s. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ042-190000- Audrain MO- Including the city of Mexico 1127 AM CDT Mon May 18 2026 .THIS AFTERNOON...Showers with a chance of thunderstorms early, then showers with thunderstorms likely. Locally heavy rainfall possible early. Cooler with highs in the mid 70s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent. .TONIGHT...Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Locally heavy rainfall possible after midnight. Lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 60 percent. .TUESDAY...Showers likely with a chance of thunderstorms. Highs in the mid 70s. Temperature falling into the lower 70s 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 with a 20 percent chance of showers. Cooler. Less humid with lows in the lower 50s. North winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY...Partly sunny. Cooler with highs in the mid 60s. Northeast winds around 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. .THURSDAY...Mostly sunny. A slight chance of showers in the afternoon. Highs around 70. Chance of rain 20 percent. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 50s. Chance of rain 40 percent. .FRIDAY...Mostly cloudy with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 40 percent. .FRIDAY NIGHT AND SATURDAY...Mostly cloudy. Lows in the mid 50s. Highs around 80. .SATURDAY NIGHT...Partly cloudy. Lows in the upper 50s. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ041-047-048-190000- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Thunderstorms likely. Showers. Some thunderstorms may produce heavy rainfall. Locally heavy rainfall possible early. Cooler with highs in the mid 70s. South winds around 15 mph with gusts up to 30 mph. Chance of rain 90 percent. .TONIGHT...Mostly cloudy. A chance of showers and thunderstorms. Some thunderstorms may produce heavy rainfall in the evening. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent. .TUESDAY...A chance of thunderstorms. Showers. Highs in the upper 70s. Southwest winds 5 to 10 mph, becoming northwest in the afternoon. Gusts up to 25 mph. Chance of rain 90 percent. .TUESDAY NIGHT...Mostly cloudy. A chance of showers, mainly in the evening. Cooler. Less humid with lows in the lower 50s. North winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50 percent. .WEDNESDAY...Partly sunny. Cooler with highs in the upper 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows around 50. .THURSDAY...Partly sunny. A chance of showers in the afternoon. Highs in the lower 70s. Chance of rain 30 percent. .THURSDAY NIGHT...Mostly cloudy with a 50 percent chance of showers. Lows in the mid 50s. .FRIDAY...Mostly cloudy with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 50 percent. .FRIDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Lows in the upper 50s. Chance of rain 20 percent. .SATURDAY...Partly sunny. Highs in the lower 80s. .SATURDAY NIGHT...Partly cloudy. Lows around 60. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20 percent. $$ ILZ095>097-MOZ018-019-026-027-034>036-190000- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Monroe MO-Ralls MO-Pike MO- Including the cities of Quincy, Mount Sterling, Pittsfield, Hannibal, and Bowling Green 1127 AM CDT Mon May 18 2026 .THIS AFTERNOON...Showers with a chance of thunderstorms early, then showers and thunderstorms likely. Locally heavy rainfall possible early. Highs in the upper 70s. South winds 15 to 20 mph with gusts up to 35 mph. Chance of rain 90 percent. .TONIGHT...Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Locally heavy rainfall possible after midnight. Lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 70 percent. .TUESDAY...Mostly cloudy with a chance of showers and thunderstorms. Highs in the upper 70s. Southwest winds 10 to 15 mph, becoming northwest in the afternoon. Gusts up to 30 mph. Chance of rain 50 percent. .TUESDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening. 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. Cooler with highs in the upper 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 40s. .THURSDAY...Mostly sunny. A slight chance of showers in the afternoon. Highs around 70. Chance of rain 20 percent. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 50s. Chance of rain 50 percent. .FRIDAY...Mostly cloudy with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 50 percent. .FRIDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a slight chance of showers. Lows in the mid 50s. Chance of rain 20 percent. .SATURDAY...Partly sunny. Highs around 80. .SATURDAY NIGHT...Partly cloudy. Lows in the upper 50s. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ069-070-074-190000- Clinton IL-Marion IL-Washington IL- Including the cities of Centralia and Salem 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Mostly cloudy. A chance of showers and thunderstorms early, then showers with thunderstorms likely. Near steady temperature in the upper 70s. Southwest winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent. .TONIGHT...Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent. .TUESDAY...Partly sunny with a chance of showers and thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the mid 80s. Southwest winds 15 to 20 mph. Chance of rain near100 percent. .TUESDAY NIGHT...Showers with a chance of thunderstorms in the evening, then showers likely after midnight. Lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain near 100 percent. .WEDNESDAY...Mostly cloudy. A slight chance of showers in the morning. Much cooler. Less humid with highs around 70. North winds around 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. Lows in the lower 50s. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 50s. Chance of rain 40 percent. .FRIDAY...Showers likely in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 60 percent. .FRIDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the lower 60s. Chance of rain 50 percent. .SATURDAY...Mostly cloudy with a slight chance of showers and thunderstorms in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50 percent. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows in the lower 60s. Highs in the mid 80s. $$ MOZ074-084-085-099-190000- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 1127 AM CDT Mon May 18 2026 .THIS AFTERNOON...Mostly cloudy with a chance of thunderstorms. A chance of showers. Locally heavy rainfall possible. Highs in the mid 80s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent. .TONIGHT...Mostly cloudy. A chance of showers and thunderstorms in the evening. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent. .TUESDAY...A chance of showers and thunderstorms in the morning, then showers with 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 near 100 percent. .TUESDAY NIGHT...Showers. A chance of thunderstorms, mainly in the evening. Cooler with lows in the mid 50s. Northwest winds 5 to 10 mph, becoming north with gusts up to 20 mph after midnight. Chance of rain near 100 percent. .WEDNESDAY...Mostly cloudy with a 50 percent chance of showers. Much cooler. Less humid with highs around 70. North winds 5 to 10 mph with gusts up to 20 mph. .WEDNESDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening. Lows in the lower 50s. Chance of rain 20 percent. .THURSDAY...Partly sunny. Highs in the mid 70s. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 50s. Chance of rain 50 percent. .FRIDAY...Showers likely. A chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 70 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...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy after midnight. Lows around 60. Chance of rain 20 percent. .SUNDAY...Partly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ051-052-060-190000- Montgomery MO-Lincoln MO-Warren MO- 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Showers. A chance of thunderstorms early, then thunderstorms likely. Some thunderstorms may produce heavy rainfall early. Some thunderstorms may produce heavy rainfall. Cooler. Near steady temperature in the lower 70s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TONIGHT...Mostly cloudy. Thunderstorms likely with a chance of showers in the evening, then a chance of showers and thunderstorms after midnight. Some thunderstorms may produce heavy rainfall in the evening. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 60 percent. .TUESDAY...Showers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the lower 80s. Temperature falling into the mid 70s in the afternoon. Southwest winds 10 to 15 mph, becoming west in the afternoon. Chance of rain near 100 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...Mostly cloudy in the morning, then becoming partly sunny. Cooler with highs in the upper 60s. Northeast winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms 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 a chance of showers after midnight. Lows in the mid 50s. Chance of rain 40 percent. .FRIDAY...Mostly cloudy with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 50 percent. .FRIDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers after midnight. Lows in the mid 50s. Chance of rain 50 percent. .SATURDAY...Partly sunny. Highs in the lower 80s. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows in the upper 50s. Highs in the mid 80s. $$ ILZ058-059-098-099-190000- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 1127 AM CDT Mon May 18 2026 .THIS AFTERNOON...Showers with a chance of thunderstorms early, then showers with thunderstorms likely. Locally heavy rainfall possible early. Cooler. Near steady temperature in the mid 70s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TONIGHT...Mostly cloudy. Showers and thunderstorms likely, mainly in the evening. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 60 percent. .TUESDAY...Showers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the lower 80s. Temperature falling into the upper 70s in the afternoon. South winds 10 to 15 mph, becoming west in the afternoon. Chance of rain near 100 percent. .TUESDAY NIGHT...Mostly cloudy. Showers likely with a chance of thunderstorms in the evening, then a slight chance of showers after midnight. Cooler. Less humid with lows in the lower 50s. Northwest winds 5 to 10 mph. Chance of rain 70 percent. .WEDNESDAY...Partly sunny. Much cooler with highs in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. .THURSDAY...Mostly sunny. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers after midnight. Lows in the lower 50s. Chance of rain 20 percent. .FRIDAY...Mostly cloudy with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 50 percent. .FRIDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the mid 50s. Chance of rain 50 percent. .SATURDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs around 80. Chance of rain 40 percent. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows in the upper 50s. Highs in the mid 80s. $$ ILZ064-065-190000- Bond IL-Fayette IL- Including the city of Vandalia 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Showers. A chance of thunderstorms early, then thunderstorms likely. Near steady temperature in the mid 70s. Southwest winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TONIGHT...Mostly cloudy with showers and thunderstorms likely in the evening, then partly cloudy after midnight. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 60 percent. .TUESDAY...Showers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the lower 80s. Southwest winds 15 to 20 mph. Chance of rain near 100 percent. .TUESDAY NIGHT...Showers with a chance of thunderstorms in the evening, then showers likely after midnight. Lows in the upper 50s. Northwest winds 5 to 10 mph. Chance of rain near 100 percent. .WEDNESDAY...Mostly cloudy. Much cooler with highs in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the upper 40s. .THURSDAY...Mostly sunny. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers after midnight. Lows in the mid 50s. Chance of rain 20 percent. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the lower 70s. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the upper 70s. Chance of rain 40 percent. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows in the lower 60s. Highs in the mid 80s. $$ ILZ060-190000- Montgomery IL- Including the city of Litchfield 1127 AM CDT Mon May 18 2026 .THIS AFTERNOON...Showers. A chance of thunderstorms early, then thunderstorms likely. Near steady temperature in the mid 70s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TONIGHT...Mostly cloudy with showers and thunderstorms likely in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 60s. South winds around 15 mph with gusts up to 25 mph. Chance of rain 60 percent. .TUESDAY...Showers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the lower 80s. Temperature falling into the upper 70s in the afternoon. Southwest winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TUESDAY NIGHT...Showers likely with a chance of thunderstorms in the evening, then a chance of showers after midnight. Cooler with 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. Much cooler with highs in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows in the mid 40s. .THURSDAY...Mostly sunny. Highs around 70. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers after midnight. Lows in the lower 50s. Chance of rain 20 percent. .FRIDAY...Mostly cloudy with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 70s. Chance of rain 50 percent. .FRIDAY NIGHT AND SATURDAY...Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the upper 50s. Highs in the upper 70s. Chance of rain 40 percent. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows in the upper 50s. Highs in the lower 80s. $$ ILZ079-MOZ075-190000- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 1127 AM CDT Mon May 18 2026 .THIS AFTERNOON...Mostly cloudy. A chance of showers and thunderstorms early, then showers and thunderstorms likely. Locally heavy rainfall possible. Near steady temperature in the lower 80s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 70 percent. .TONIGHT...Mostly cloudy with a chance of showers and thunderstorms in the 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 50 percent. .TUESDAY...A chance of showers and thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the mid 80s. Temperature falling into the lower 80s in the afternoon. Southwest winds 10 to 15 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TUESDAY NIGHT...A chance of thunderstorms in the evening. Showers, cooler with lows in the upper 50s. Northwest winds 5 to 10 mph, becoming north with gusts up to 20 mph after midnight. Chance of rain near 100 percent. .WEDNESDAY...A slight chance of thunderstorms in the morning. Mostly cloudy with a chance of showers. Much cooler. Less humid with highs around 70. North winds 5 to 10 mph. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening. Lows in the lower 50s. Chance of rain 20 percent. .THURSDAY...Partly sunny. Highs in the mid 70s. .THURSDAY NIGHT...Mostly cloudy. A chance of showers after midnight. Lows in the upper 50s. Chance of rain 50 percent. .FRIDAY...Showers likely. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 60 percent. .FRIDAY NIGHT...A slight chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY...Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50 percent. .SATURDAY NIGHT...Partly cloudy. Lows around 60. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ059-062-072-073-190000- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Showers with a chance of thunderstorms early, then showers with thunderstorms likely. Some thunderstorms may produce heavy rainfall. Locally heavy rainfall possible. Near steady temperature in the mid 70s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TONIGHT...Mostly cloudy. A chance of showers and thunderstorms in the evening, then a chance of thunderstorms with a slight chance of showers after midnight. Some thunderstorms may produce heavy rainfall in the evening. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent. .TUESDAY...Showers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the mid 80s. Temperature falling into the upper 70s in the afternoon. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain near 100 percent. .TUESDAY NIGHT...Showers with a chance of thunderstorms in the evening, then showers likely after midnight. Cooler with lows in the mid 50s. North winds around 5 mph. Chance of rain near 100 percent. .WEDNESDAY...Mostly cloudy. A chance of showers, mainly in the morning. Much cooler with highs in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy. Lows around 50. .THURSDAY...Partly sunny. 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 a chance of showers after midnight. Lows in the mid 50s. Chance of rain 40 percent. .FRIDAY...Mostlycloudy. A chance of showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 60 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...Partly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent. .SATURDAY NIGHT...Partly cloudy. Lows in the upper 50s. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ102-MOZ065-190000- Monroe IL-Jefferson MO- 1127 AM CDT Mon May 18 2026 ...FLOOD WATCH IN EFFECT UNTIL 7 PM CDT THIS EVENING... .THIS AFTERNOON...Showers with a chance of thunderstorms early, then showers with thunderstorms likely. Some thunderstorms may produce heavy rainfall. Locally heavy rainfall possible. Near steady temperature in the upper 70s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 90 percent. .TONIGHT...Mostly cloudy with showers likely with a chance of thunderstorms in the evening, then partly cloudy after midnight. Some thunderstorms may produce heavy rainfall in the evening. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 60 percent. .TUESDAY...Showers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the mid 80s. Temperature falling to around 80 in the afternoon. Southwest winds 5 to 10 mph with gusts up to 25 mph. Chance of rain near 100 percent. .TUESDAY NIGHT...Showers with a chance of thunderstorms in the evening, then showers likely after midnight. Cooler with lows in the mid 50s. Northwest winds 5 to 10 mph. Chance of rain near 100 percent. .WEDNESDAY...Mostly cloudy with a 20 percent chance of showers. Much cooler. Less humid with highs in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. Lows in the lower 50s. Highs in the lower 70s. .THURSDAY NIGHT...Mostly cloudy. A chance of showers after midnight. Lows in the mid 50s. Chance of rain 40 percent. .FRIDAY...Showers likely. A chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 60 percent. .FRIDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers after midnight. Lows in the upper 50s. Chance of rain 50 percent. .SATURDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 40 percent. .SATURDAY NIGHT...Partly cloudy. Lows around 60. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$