FPUS65 KTFX 180430 SFPMT State Forecast For Montana National Weather Service Great Falls MT 1030 PM MDT Sun May 17 2026 MTZ001>007-043-181000- West of the Continental Divide- National Weather Service Missoula MT 1030 PM MDT Sun May 17 2026 ...FROST ADVISORY IN EFFECT UNTIL 8 AM MDT MONDAY for Kootenai/Cabinet Region...Lower Clark Fork Region... ...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT MDT TONIGHT for West Glacier Region...Bitterroot/Sapphire Mountains...Butte/Blackfoot Region...Potomac/Seeley Lake Region... ...FROST ADVISORY IN EFFECT UNTIL 9 AM MDT MONDAY for Flathead/Mission Valleys...Missoula/Bitterroot Valleys... .TONIGHT...Partly cloudy with areas of rain and snow. Widespread frost. Lows in the mid 20s to lower 30s. .MONDAY...Partly cloudy with a slight chance of showers and thunderstorms. Widespread frost. Highs in the mid 50s to lower 60s. .MONDAY NIGHT...Partly cloudy. Widespread frost. Lows in the upper 20s to mid 30s. .TUESDAY...Partly cloudy. Areas of frost in the morning. Highs in the 60s. .WEDNESDAY...Partly cloudy. Chance of rain showers. Lows in the 30s. Highs in the 60s. .THURSDAY...Partly cloudy. A chance of rain. Lows in the 30s to lower 40s. Highs in the mid 60s to lower 70s. .FRIDAY...Partly cloudy. Lows in the mid 30s to lower 40s. Highs in the upper 60s to mid 70s. $$ MTZ301>314-316>318-181000- Central Montana- National Weather Service Great Falls MT 1030 PM MDT Sun May 17 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR Southern Rocky Mountain Front...Little Belt and Highwood Mountains... .REST OF TONIGHT...Mostly cloudy. Slight chance of rain late in the evening. Slight chance of snow through the night. Lows 25 to 30...20 to 25 in the mountains. .MONDAY...Mostly cloudy in the morning then becoming partly cloudy. Highs 45 to 55...35 to 45 in the mountains. .MONDAY NIGHT...Partly cloudy. Lows 25 to 30. .TUESDAY...Partly cloudy. Highs 55 to 65. .WEDNESDAY...Mostly cloudy. Chance of rain showers and slight chance of thunderstorms. Lows 35 to 40. Highs 55 to 65. .THURSDAY...Partly cloudy. Slight chance of rain. Lows 35 to 40. Highs 60 to 70. .FRIDAY...Mostly cloudy. Chance of rain showers and slight chance of thunderstorms. Lows 40 to 45. Highs 60 to 70. $$ MTZ315-319>330-181000- Southwest Montana- National Weather Service Great Falls MT 1030 PM MDT Sun May 17 2026 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR Upper Blackfoot and MacDonald Pass... .REST OF TONIGHT...Mostly cloudy. Slight chance of snow. Lows 25 to 30...20 to 25 in the mountains. Gusts up to 35 mph late in the evening. .MONDAY...Mostly cloudy in the morning then becoming partly cloudy. Highs 45 to 55...35 to 45 in the mountains. Gusts up to 35 mph in the morning. .MONDAY NIGHT...Mostly clear. Lows 25 to 30...20 to 25 in the mountains. .TUESDAY...Partly cloudy. Highs 50 to 60. .WEDNESDAY...Partly cloudy. Chance of rain. Lows 30 to 35. Highs 50 to 60. .THURSDAY...Partly cloudy. Slight chance of rain. Lows 30 to 35. Highs 55 to 65. .FRIDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 35 to 40. Highs 55 to 65. $$ MTZ016>027-059>062-181000- Northeast Montana- National Weather Service Glasgow MT 1030 PM MDT Sun May 17 2026 .TONIGHT...Mostly cloudy with a chance of rain showers. Lows in the lower to mid 30s. .MONDAY...Mostly cloudy with a slight chance of rain showers. Highs in the mid to upper 40s. .MONDAY NIGHT...Mostly cloudy. Lows in the mid 20s to lower 30s. .TUESDAY...Partly cloudy. A slight chance of showers and thunderstorms in the afternoon and evening. Highs in the lower to mid 60s. .WEDNESDAY...Mostly cloudy with a slight chance of showers and thunderstorms. Highs in the mid 60s to lower 70s. Lows in the mid 30s to lower 40s. .THURSDAY...Partly cloudy with a slight chance of rain showers. Highs in the mid to upper 60s. Lows near 40. .FRIDAY...Mostly cloudy with a slight chance of showers and thunderstorms. Highs near 70. Lows in the lower to mid 40s. $$ MTZ028>042-056>058-063>068-181000- South Central and Southeast Montana- National Weather Service Billings MT 1030 PM MDT Sun May 17 2026 ...Winter Weather Advisory in effect until noon MDT Monday for portions of South Central Montana... .REST OF TONIGHT...Mostly cloudy. Slight chance of rain showers and snow showers. Lows in the upper 20s to the upper 30s. .MONDAY...Cloudy. Patchy blowing snow. Slight chance of rain showers and snow showers. Highs in the lower 40s to the lower 50s. .MONDAY NIGHT...Partly cloudy. Lows in the mid 20s to lower 30s. .TUESDAY...Sunny. Highs in the upper 50s to the upper 60s. .TUESDAY NIGHT...Partly cloudy. Lows in the mid 30s to lower 40s. .WEDNESDAY...Mostly sunny. Chance of rain showers and isolated thunderstorms. Highs in the lower 60s to the lower 70s. .WEDNESDAY NIGHT...Mostly cloudy. Chance of rain showers and slight chance of thunderstorms. Lows in the mid 30s to the mid 40s. .THURSDAY...Mostly sunny. Slight chance of rain showers. Highs in the lower 60s to the lower 70s. .THURSDAY NIGHT...Mostly cloudy. Slight chance of rain showers. Lows in the upper 30s to the upper 40s. .FRIDAY...Partly sunny. Slight chance of thunderstorms. Highs in the mid 60s to the mid 70s. $$