FPUS65 KTFX 232138 AFPTFX Central and Southwest Montana Area Forecast National Weather Service Great Falls MT 337 PM MDT Sat May 23 2026 MTZ301>314-316>318-241200- Central Montana- National Weather Service Great Falls MT 337 PM MDT Sat May 23 2026 .TONIGHT...Partly cloudy. Lows 45 to 50. .SUNDAY...Partly cloudy. Highs 75 to 85...60 to 70 in the mountains. West winds 20 to 25 mph in the afternoon. .SUNDAY NIGHT...Mostly cloudy in the evening then becoming partly cloudy. Lows 45 to 50. .MEMORIAL DAY...Mostly clear. Slight chance of rain. Highs 80 to 90. .TUESDAY...Partly cloudy. Chance of rain showers and slight chance of thunderstorms. Lows 50 to 60. Highs 80 to 90. .WEDNESDAY...Not as warm. Rain showers likely and chance of thunderstorms. Lows 45 to 55. Highs 65 to 75. .THURSDAY...Mostly cloudy. Chance of rain showers and slight chance of thunderstorms. Lows 45 to 55. Highs 70 to 80. $$ MTZ315-319>330-241200- Southwest Montana- National Weather Service Great Falls MT 337 PM MDT Sat May 23 2026 .TONIGHT...Partly cloudy. Lows 35 to 45. .SUNDAY...Sunny. Highs 70 to 80...60 to 70 in the mountains. .SUNDAY NIGHT...Partly cloudy. Lows 40 to 50. .MEMORIAL DAY...Partly cloudy. Highs 70 to 80. .TUESDAY...Rain showers likely and slight chance of thunderstorms. Lows 45 to 50. Highs 70 to 80. .WEDNESDAY...Mostly cloudy. Chance of showers and thunderstorms. Lows 40 to 50. Highs 60 to 70. .THURSDAY...Mostly cloudy. Chance of showers and thunderstorms. Lows 40 to 45. Highs 65 to 75. $$