National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Rapid Warm-Up Forecast Across Much of the Lower 48 Today and Tuesday

Most of the U.S. starts the week calm and unseasonably warm. The Heartland will be warmest, with highs 25–30° above average. Only the Gulf Coast stays chilly. Rain today is limited to western Washington while lake effect snow continues east of Lake Ontario. Cooler air returns after Tuesday, bringing a wintry mix to the Midwest and Northeast by Wednesday. Read More >

Current conditions at

Garrison I-90 MP 174.4 (MTGAR)

Lat: 46.52361°NLon: 112.80843°WElev: 4327.0ft.

NA

49°F

9°C

Humidity 42%
Wind Speed NW 7 MPH
Barometer NA
Dewpoint 27°F (-3°C)
Visibility NA
Wind Chill46°F (8°C)
Last update 12 Jan 04:30 PM MST
Extended Forecast for

Garrison MT

  • Tonight

    Tonight: Mostly cloudy, with a low around 37. South southwest wind 6 to 11 mph, with gusts as high as 25 mph.

    Low: 37 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 50. East wind around 7 mph becoming west northwest in the morning.

    High: 50 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 29. West northwest wind around 6 mph becoming calm in the evening.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 44. Calm wind becoming west around 5 mph in the afternoon.

    High: 44 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 25. West wind around 5 mph becoming calm in the evening.

    Low: 25 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 37. South southwest wind 6 to 11 mph, with gusts as high as 25 mph.
Tuesday
Partly sunny, with a high near 50. East wind around 7 mph becoming west northwest in the morning.
Tuesday Night
Mostly cloudy, with a low around 29. West northwest wind around 6 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 44. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 25. West wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 18.
Friday
Mostly sunny, with a high near 37.
Friday Night
Partly cloudy, with a low around 20.
Saturday
Sunny, with a high near 43.
Saturday Night
Mostly clear, with a low around 21.
Sunday
Sunny, with a high near 44.
Sunday Night
Mostly clear, with a low around 22.
M.L.King Day
Sunny, with a high near 44.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Garrison MT
 46.51°N 112.81°W (Elev. 4380 ft)
Last Update:
1:01 pm MST Jan 12, 2026
Forecast Valid:
4pm MST Jan 12, 2026-6pm MST Jan 19, 2026
 
Forecast Discussion
 
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