FPUS65 KTFX 200000 SFPMT State Forecast For Montana National Weather Service Great Falls MT 600 PM MDT Tue May 19 2026 MTZ001>007-043-201000- West of the Continental Divide- National Weather Service Missoula MT 600 PM MDT Tue May 19 2026 .TONIGHT...Mostly cloudy with a slight chance of rain. Lows in the 30s. .WEDNESDAY...Mostly cloudy with a chance of showers and thunderstorms. Highs in the 60s. .WEDNESDAY NIGHT...Rain showers likely. Lows in the 30s. .THURSDAY...Partly cloudy. Highs in the 60s. .FRIDAY...Partly cloudy. Lows in the 30s to lower 40s. Highs in the upper 60s to mid 70s. .SATURDAY...Partly cloudy. Lows in the upper 30s to mid 40s. Highs in the 70s to lower 80s. .SUNDAY...Partly cloudy. Lows in the 40s. Highs in the mid 70s to lower 80s. $$ MTZ301>314-316>318-201000- Central Montana- National Weather Service Great Falls MT 600 PM MDT Tue May 19 2026 .TONIGHT...Mostly cloudy. Slight chance of rain showers in the evening. Lows 35 to 40. .WEDNESDAY...Mostly cloudy. Slight chance of rain in the morning. Chance of thunderstorms in the afternoon. Highs 50 to 60...45 to 55 in the mountains. .WEDNESDAY NIGHT...Mostly cloudy. Chance of rain through the night. Lows 35 to 40...30 to 35 in the mountains. .THURSDAY...Partly cloudy. Highs 55 to 65. .FRIDAY...Partly cloudy. Lows 35 to 40. Highs 60 to 70. .SATURDAY...Partly cloudy. Lows 40 to 45. Highs 70 to 80. .SUNDAY...Partly cloudy. Lows 45 to 50. Highs 75 to 85. $$ MTZ315-319>330-201000- Southwest Montana- National Weather Service Great Falls MT 600 PM MDT Tue May 19 2026 .TONIGHT...Mostly cloudy. Slight chance of rain and snow showers in the evening. Lows 30 to 35. .WEDNESDAY...Mostly cloudy. Slight chance of thunderstorms in the afternoon. Highs 55 to 60...45 to 55 in the mountains. .WEDNESDAY NIGHT...Cloudy. Chance of snow showers and slight chance of thunderstorms in the evening. Rain through the night. Snow after midnight. Lows 30 to 40. .THURSDAY...Mostly cloudy. Chance of rain and snow. Highs 45 to 55. .FRIDAY...Partly cloudy. Lows 30 to 35. Highs 55 to 65. .SATURDAY...Partly cloudy. Lows 35 to 40. Highs 65 to 75. .SUNDAY...Partly cloudy. Lows 40 to 45. Highs 65 to 75. $$ MTZ016>027-059>062-201000- Northeast Montana- National Weather Service Glasgow MT 600 PM MDT Tue May 19 2026 .TONIGHT...Mostly cloudy. Lows near 40. .WEDNESDAY...Mostly cloudy. A chance of rain showers and a slight chance of thunderstorms in the afternoon. Highs in the mid 60s to lower 70s. .WEDNESDAY NIGHT...Mostly cloudy. A slight chance of rain showers in the evening, then a chance of rain showers after midnight. Lows near 40. .THURSDAY...Mostly cloudy with a chance of rain showers. Highs in the lower to mid 60s. .FRIDAY...Partly cloudy. Highs in the mid 60s to lower 70s. Lows near 40. .SATURDAY...Partly cloudy. Highs in the mid to upper 70s. Lows in the lower to mid 40s. .SUNDAY...Partly cloudy. Highs in the lower to mid 80s. Lows in the mid 40s to lower 50s. $$ MTZ028>042-056>058-063>068-201000- South Central and Southeast Montana- National Weather Service Billings MT 600 PM MDT Tue May 19 2026 .TONIGHT...Mostly cloudy. Lows in the lower 30s to the lower 40s. .WEDNESDAY...Partly sunny. Chance of rain showers and slight chance of thunderstorms. Highs in the lower 60s to the lower 70s. .WEDNESDAY NIGHT...Cloudy. Showers, snow showers and slight chance of thunderstorms west...and chance of showers east. Lows in the mid 30s to the mid 40s. .THURSDAY...Mostly cloudy. Showers, snow showers and slight chance of thunderstorms west...and chance of showers east. Highs around 50 to the lower 60s. .THURSDAY NIGHT...Mostly cloudy. Areas of frost west...and chance of showers east. Lows in the lower 30s to around 40. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Lows in the mid 30s to the mid 40s. Highs in the lower 60s to the lower 70s. .SATURDAY...Sunny. Highs in the lower 70s to the lower 80s. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows in the lower 40s to the lower 50s. Highs in the upper 70s to the upper 80s. $$