FPUS65 KTFX 211838 AFPTFX Central and Southwest Montana Area Forecast National Weather Service Great Falls MT 1237 PM MDT Thu May 21 2026 MTZ301>314-316>318-220000- Central Montana- National Weather Service Great Falls MT 1237 PM MDT Thu May 21 2026 .REST OF TODAY...Mostly cloudy. Slight chance of rain showers. Highs 55 to 60...45 to 55 in the mountains. .TONIGHT...Partly cloudy. Lows 35 to 40...25 to 35 in the mountains. .FRIDAY...Increasing clouds. Slight chance of rain showers in the afternoon and evening. Highs 60 to 70...50 to 60 in the mountains. .SATURDAY...Partly cloudy. Lows 40 to 45. Highs 70 to 80. .SUNDAY...Mostly clear. Lows 45 to 50. Highs 75 to 85. .MEMORIAL DAY...Partly cloudy. Slight chance of rain. Lows 45 to 50. Highs 75 to 85. $$ MTZ315-319>330-220000- Southwest Montana- National Weather Service Great Falls MT 1237 PM MDT Thu May 21 2026 .REST OF TODAY...Partly cloudy. Highs 50 to 55...40 to 50 in the mountains. .TONIGHT...Partly cloudy. Lows 30 to 35...25 to 30 in the mountains. .FRIDAY...Increasing clouds. Highs 60 to 65...50 to 60 in the mountains. .SATURDAY...Partly cloudy. Lows 35 to 40. Highs 65 to 75. .SUNDAY...Partly cloudy. Lows 40 to 45. Highs 65 to 75. .MEMORIAL DAY...Partly cloudy. Lows 40 to 45. Highs 70 to 80. $$