FPUS65 KTFX 222138 AFPTFX Central and Southwest Montana Area Forecast National Weather Service Great Falls MT 337 PM MDT Sun Mar 22 2026 MTZ301>314-316>318-231200- Central Montana- National Weather Service Great Falls MT 337 PM MDT Sun Mar 22 2026 .TONIGHT...Increasing clouds. Lows 25 to 35. .MONDAY...Mostly cloudy in the morning then clearing. Highs 50 to 60...45 to 55 in the mountains. .MONDAY NIGHT...Mostly cloudy. Lows 30 to 40. .TUESDAY...Mostly cloudy. Chance of rain and snow. Highs 45 to 55. .WEDNESDAY...Mostly cloudy. Chance of rain and snow. Lows 35 to 45. Highs 55 to 65. .THURSDAY...Partly cloudy. Colder. Slight chance of snow. Lows 20 to 25. Highs 35 to 45. .FRIDAY...Mostly clear. Lows 20 to 25. Highs 45 to 55. $$ MTZ315-319>330-231200- Southwest Montana- National Weather Service Great Falls MT 337 PM MDT Sun Mar 22 2026 .TONIGHT...Increasing clouds. Lows 30 to 35. .MONDAY...Mostly cloudy in the morning then clearing. Highs 55 to 65...45 to 55 in the mountains. .MONDAY NIGHT...Mostly cloudy. Lows 35 to 45...30 to 40 in the mountains. .TUESDAY...Mostly cloudy. Slight chance of rain. Highs 50 to 60. .WEDNESDAY...Mostly cloudy. Chance of rain and snow. Lows 40 to 45. Highs 55 to 65. .THURSDAY...Partly cloudy. Cooler. Chance of snow. Lows 25 to 30. Highs 40 to 50. .FRIDAY...Mostly clear. Lows 20 to 25. Highs 45 to 55. $$