FPUS65 KTFX 191030 SFPMT State Forecast For Montana National Weather Service Great Falls MT 430 AM MDT Tue May 19 2026 MTZ001>007-043-192200- West of the Continental Divide- National Weather Service Missoula MT 430 AM MDT Tue May 19 2026 ...FROST ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING for Flathead/Mission Valleys...Lower Clark Fork Region...Missoula/Bitterroot Valleys...Bitterroot/Sapphire Mountains... .TODAY...Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Areas of frost. Highs in the 60s. .TONIGHT...Mostly cloudy with a slight chance of rain. Lows in the 30s. .WEDNESDAY...Mostly cloudy. A chance of rain in the morning, then rain showers likely in the afternoon and evening. Highs in the 60s. .THURSDAY...Partly cloudy. A chance of rain. Lows in the 30s. Highs in the 60s to lower 70s. .FRIDAY...Partly cloudy. Lows in the mid 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. $$ MTZ301>314-316>318-192200- Central Montana- National Weather Service Great Falls MT 430 AM MDT Tue May 19 2026 .TODAY...Increasing clouds. Chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 60 to 65...45 to 55 in the mountains. .TONIGHT...Mostly cloudy. Slight chance of rain. Lows 35 to 40. .WEDNESDAY...Mostly cloudy. Chance of rain in the morning. Slight chance of thunderstorms in the afternoon. Highs 55 to 60...45 to 55 in the mountains. .THURSDAY...Partly cloudy. Chance of rain. Lows 35 to 40. Highs 55 to 65. .FRIDAY...Partly cloudy. Lows 35 to 40. Highs 60 to 70. .SATURDAY...Partly cloudy. Lows 40 to 45. Highs 70 to 80. $$ MTZ315-319>330-192200- Southwest Montana- National Weather Service Great Falls MT 430 AM MDT Tue May 19 2026 .TODAY...Increasing clouds. Slight chance of rain and snow in the afternoon. Highs 55 to 60...45 to 55 in the mountains. .TONIGHT...Mostly cloudy. Slight chance of rain and snow. Lows 30 to 40...25 to 35 in the mountains. .WEDNESDAY...Mostly cloudy. Rain showers and slight chance of thunderstorms in the afternoon and evening. Highs 55 to 65... 45 to 55 in the mountains. .THURSDAY...Mostly cloudy. Chance of rain and snow. Lows 30 to 35. Highs 50 to 60. .FRIDAY...Partly cloudy. Lows 30 to 35. Highs 55 to 65. .SATURDAY...Partly cloudy. Lows 35 to 40. Highs 65 to 75. $$ MTZ016>027-059>062-192200- Northeast Montana- National Weather Service Glasgow MT 430 AM MDT Tue May 19 2026 .TODAY...Sunny. Highs in the lower to mid 60s. .TONIGHT...Mostly cloudy. Lows near 40. .WEDNESDAY...Mostly cloudy. A chance of rain showers and a slight chance of thunderstorms in the afternoon and evening. Highs in the mid 60s to lower 70s. .THURSDAY...Mostly cloudy with a chance of rain showers. Highs in the lower to mid 60s. Lows near 40. .FRIDAY...Partly cloudy. Highs near 70. Lows near 40. .SATURDAY...Partly cloudy. Highs in the mid to upper 70s. Lows in the lower to mid 40s. $$ MTZ028>042-056>058-063>068-192200- South Central and Southeast Montana- National Weather Service Billings MT 430 AM MDT Tue May 19 2026 .TODAY...Sunny. Highs in the upper 50s to the upper 60s. .TONIGHT...Partly 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 and slight chance of thunderstorms west...and chance of showers and slight chance of thunderstorms east. Lows in the mid 30s to the mid 40s. .THURSDAY...Mostly cloudy. Chance of rain showers. Highs in the mid 50s to the mid 60s. .THURSDAY NIGHT...Mostly cloudy. Slight chance of rain showers. Lows in the lower 30s to the lower 40s. .FRIDAY...Mostly sunny. Slight chance of rain showers. Highs in the mid 60s to lower 70s. .FRIDAY NIGHT...Partly cloudy. Lows in the upper 30s to the upper 40s. .SATURDAY...Sunny. Highs in the lower 70s to the lower 80s. $$