FPUS65 KTFX 091350 AFPTFX Central and Southwest Montana Area Forecast National Weather Service Great Falls MT 749 AM MDT Thu Jul 9 2026 MTZ301>314-316>318-100000- Central Montana- National Weather Service Great Falls MT 749 AM MDT Thu Jul 9 2026 ...EXTREME HEAT WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING FOR Northern Blaine County...Fergus County below 4500ft... .REST OF TODAY...Sunny. Highs 80 to 90...70 to 80 in the mountains. .TONIGHT...Mostly clear. Lows 55 to 60...45 to 55 in the mountains. .FRIDAY...Sunny then becoming mostly clear. Highs 85 to 95... 75 to 85 in the mountains. .SATURDAY...Mostly clear. Lows 55 to 60. Highs 90 to 100. .SUNDAY...Partly cloudy. Lows 60 to 65. Highs 90 to 100. .MONDAY...Partly cloudy. Lows 60 to 65. Highs 85 to 95. $$ MTZ315-319>330-100000- Southwest Montana- National Weather Service Great Falls MT 749 AM MDT Thu Jul 9 2026 ...EXTREME HEAT WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING FOR Canyon Ferry Area...Missouri Headwaters...Madison River Valley...Gallatin Valley... .REST OF TODAY...Sunny. Highs 80 to 85...70 to 80 in the mountains. .TONIGHT...Clear. Lows 45 to 55. .FRIDAY...Sunny then becoming mostly clear. Highs 80 to 90... 70 to 80 in the mountains. .SATURDAY...Clear. Lows 50 to 60. Highs 85 to 95. .SUNDAY...Partly cloudy. Lows 55 to 60. Highs 90 to 100. .MONDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 55 to 65. Highs 80 to 90. $$