188
FPUS65 KTFX 171718
AFPTFX

Central and Southwest Montana Area Forecast
National Weather Service Great Falls MT
1118 AM MDT Thu Sep 17 2026

MTZ301>314-316>318-180000-
Central Montana-
National Weather Service Great Falls MT
1118 AM MDT Thu Sep 17 2026

...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY EVENING THROUGH
SATURDAY EVENING FOR Little Belt and Highwood Mountains...

.REST OF TODAY...Sunny. Highs 70 to 75.
.TONIGHT...Mostly cloudy in the evening then becoming partly
cloudy. Chance of rain showers. Lows 50 to 55...45 to 50 in the
mountains.
.FRIDAY...Increasing clouds. Chance of rain showers in the
afternoon and evening. Highs 70 to 75...60 to 70 in the
mountains.
.SATURDAY...Mostly cloudy. Chance of rain. Lows 45 to 50. Highs
60 to 70.
.SUNDAY...Mostly clear. Lows 45 to 50. Highs 65 to 75.
.MONDAY...Mostly clear. Lows 45 to 50. Highs 70 to 80.

$$

MTZ315-319>330-180000-
Southwest Montana-
National Weather Service Great Falls MT
1118 AM MDT Thu Sep 17 2026

...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY EVENING THROUGH
SATURDAY EVENING FOR Big Belt, Bridger and Castle
Mountains...Elkhorn and Boulder Mountains...Gallatin Valley...
...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
SATURDAY AFTERNOON FOR Northwest Beaverhead County...

.REST OF TODAY...Partly cloudy late in the morning then becoming
mostly cloudy. Chance of rain showers through the day. Slight
chance of thunderstorms in the afternoon. Highs 70 to 80...60 to
70 in the mountains.
.TONIGHT...Partly cloudy. Chance of rain showers and slight
chance of thunderstorms. Lows 40 to 50.
.FRIDAY...Mostly cloudy. Rain showers through the day. Chance of
thunderstorms in the afternoon and evening. Highs 65 to 75...
55 to 65 in the mountains.
.SATURDAY...Rain showers and slight chance of thunderstorms. Lows
40 to 50. Highs 55 to 65.
.SUNDAY...Mostly clear. Lows 40 to 45. Highs 60 to 70.
.MONDAY...Mostly clear. Lows 40 to 45. Highs 65 to 75.

$$