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Central and Southwest Montana Area Forecast
National Weather Service Great Falls MT
437 PM MDT Sun Aug 23 2026

MTZ301>314-316>318-241200-
Central Montana-
National Weather Service Great Falls MT
437 PM MDT Sun Aug 23 2026

...SEVERE THUNDERSTORM WATCH 617 IN EFFECT UNTIL 7 PM MDT THIS
EVENING FOR Northern Blaine County...Bears Paw Mountains and
Southern Blaine...Judith Basin County and Judith Gap...Fergus
County below 4500ft...Snowy and Judith Mountains...

.TONIGHT...Mostly clear. Slight chance of thunderstorms in the
evening. Some thunderstorms may be severe. Lows 50 to 60...45 to
55 in the mountains.
.MONDAY...Sunny. Highs 75 to 80...65 to 75 in the mountains.
.MONDAY NIGHT...Mostly clear. Lows 50 to 55...45 to 50 in the
mountains.
.TUESDAY...Mostly clear. Highs 75 to 85.
.WEDNESDAY...Partly cloudy. Lows 50 to 55. Highs 80 to 90.
.THURSDAY...Partly cloudy. Slight chance of showers. Lows 55 to
60. Highs 85 to 95.
.FRIDAY...Mostly clear. Lows 50 to 60. Highs 80 to 90.

$$

MTZ315-319>330-241200-
Southwest Montana-
National Weather Service Great Falls MT
437 PM MDT Sun Aug 23 2026

...SEVERE THUNDERSTORM WATCH 617 IN EFFECT UNTIL 7 PM MDT THIS
EVENING FOR Big Belt, Bridger and Castle Mountains...Missouri
Headwaters...Madison River Valley...Gallatin Valley...Beaverhead
and Western Madison below 6000ft...Ruby Mountains and Southern
Beaverhead Mountains...Gallatin and Madison County Mountains and
Centennial Mountains...

.TONIGHT...Mostly clear. Slight chance of thunderstorms in the
evening. Patchy smoke through the night. Some thunderstorms may
be severe. Lows 45 to 50.
.MONDAY...Sunny. Patchy smoke. Highs 75 to 85...65 to 75 in the
mountains.
.MONDAY NIGHT...Mostly cloudy. Patchy smoke in the evening. Lows
45 to 55.
.TUESDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Highs 70 to 80.
.WEDNESDAY...Mostly cloudy. Chance of rain showers and slight
chance of thunderstorms. Lows 50 to 55. Highs 75 to 85.
.THURSDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows 50 to 55. Highs 75 to 85.
.FRIDAY...Partly cloudy. Lows 45 to 55. Highs 75 to 85.

$$