FPUS65 KTFX 212138 AFPTFX Central and Southwest Montana Area Forecast National Weather Service Great Falls MT 338 PM MDT Sat Mar 21 2026 MTZ301>314-316>318-221200- Central Montana- National Weather Service Great Falls MT 338 PM MDT Sat Mar 21 2026 .TONIGHT...Partly cloudy. Lows 25 to 35...20 to 30 in the mountains. .SUNDAY...Sunny. Highs 45 to 55...35 to 45 in the mountains. West winds 20 to 25 mph in the afternoon. Gusts up to 35 mph. .SUNDAY NIGHT...Increasing clouds. Lows 25 to 30. .MONDAY...Mostly cloudy. Highs 50 to 60. .TUESDAY...Mostly cloudy. Slight chance of rain and snow. Lows 30 to 35. Highs 50 to 60. .WEDNESDAY...Partly cloudy. Chance of rain and snow. Lows 35 to 40. Highs 50 to 60. .THURSDAY...Partly cloudy. Slight chance of snow. Lows 20 to 30. Highs 40 to 50. $$ MTZ315-319>330-221200- Southwest Montana- National Weather Service Great Falls MT 338 PM MDT Sat Mar 21 2026 .TONIGHT...Mostly clear. Lows 25 to 35...20 to 30 in the mountains. Northwest winds around 20 mph with gusts to 40 mph in the evening. .SUNDAY...Sunny. Highs 50 to 60...40 to 50 in the mountains. .SUNDAY NIGHT...Increasing clouds. Lows 25 to 35. .MONDAY...Mostly cloudy. Highs 50 to 60. .TUESDAY...Mostly cloudy. Slight chance of rain. Lows 35 to 40. Highs 55 to 65. .WEDNESDAY...Mostly cloudy. Chance of rain and snow. Lows 35 to 45. Highs 50 to 60. .THURSDAY...Partly cloudy. Slight chance of snow. Lows 25 to 30. Highs 40 to 50. $$