697 FPUS65 KTFX 181248 AFPTFX Central and Southwest Montana Area Forecast National Weather Service Great Falls MT 648 AM MDT Mon May 18 2026 MTZ301>314-316>318-190000- Central Montana- National Weather Service Great Falls MT 648 AM MDT Mon May 18 2026 .REST OF TODAY...Partly cloudy. Patchy fog in the morning. Highs 45 to 55...35 to 45 in the mountains. .TONIGHT...Mostly clear. Lows 25 to 30. .TUESDAY...Increasing clouds. Slight chance of rain in the afternoon and evening. Highs 60 to 65...45 to 55 in the mountains. .WEDNESDAY...Mostly cloudy. Chance of rain. Lows 35 to 40. Highs 55 to 65. .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. $$ MTZ315-319>330-190000- Southwest Montana- National Weather Service Great Falls MT 648 AM MDT Mon May 18 2026 .REST OF TODAY...Partly cloudy. Slight chance of snow in the morning. Highs 40 to 50...30 to 40 in the mountains. Gusts up to 35 mph in the morning. .TONIGHT...Mostly clear. Lows 20 to 30...15 to 25 in the mountains. .TUESDAY...Increasing clouds in the afternoon then becoming partly cloudy. Slight chance of rain and snow in the afternoon and evening. Highs 50 to 60...40 to 50 in the mountains. .WEDNESDAY...Partly cloudy. Chance of rain. Lows 25 to 35. Highs 50 to 60. .THURSDAY...Partly cloudy. Chance of rain and snow. Lows 30 to 35. Highs 50 to 60. .FRIDAY...Partly cloudy. Lows 30 to 40. Highs 55 to 65. $$