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

Heavy Rainfall Threat Continues in the Southwest on Monday; Record Warmth in the Plains and Midwest

Remnant moisture from Tropical Storm Rachel will persist over portions of the Great Basin and Southwest on Monday, bringing a potential heavy to excessive rainfall risk. Well above average and potentially record breaking temperatures will develop across the Plains and Midwest early this week, spreading into the Lower Mississippi Valley and Southeast midweek. Read More >

Hazardous Weather Conditions

Current conditions at

Garrison I-90 MP 174.4 (MTGAR)

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

unknown precip

29°F

-2°C

Humidity 86%
Wind Speed ESE 0 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Last update 12 Oct 01:30 AM MDT
Extended Forecast for

Garrison MT

Winter Storm Warning until October 12, 06:00am
Click here for hazard details and duration
Winter Storm Warning
  •  
    Winter Storm Warning until October 12, 06:00am

    NOW until 6:00am Mon

    Winter Storm Warning

  • Overnight

    Low: 26 °F

    Slight Chance
    Snow

  • Columbus Day

    Columbus Day: Patchy fog between 7am and 10am. Otherwise, partly sunny, with a high near 41. Calm wind.

    High: 41 °F

    Patchy Fog
    then Partly
    Sunny

  • Monday Night

    Monday Night: Areas of fog after 8pm. Otherwise, partly cloudy, with a low around 15. Calm wind.

    Low: 15 °F

    Areas Fog

  • Tuesday

    Tuesday: Patchy fog before noon. Otherwise, mostly sunny, with a high near 46. Calm wind.

    High: 46 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 9pm. Otherwise, mostly clear, with a low around 16. Calm wind.

    Low: 16 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 10am. Otherwise, sunny, with a high near 51.

    High: 51 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Patchy fog after midnight. Otherwise, partly cloudy, with a low around 21.

    Low: 21 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 11am. Otherwise, sunny, with a high near 55.

    High: 55 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Overnight
A 20 percent chance of snow before 2am. Mostly cloudy, with a low around 26. Light and variable wind becoming south around 5 mph.
Columbus Day
Patchy fog between 7am and 10am. Otherwise, partly sunny, with a high near 41. Calm wind.
Monday Night
Areas of fog after 8pm. Otherwise, partly cloudy, with a low around 15. Calm wind.
Tuesday
Patchy fog before noon. Otherwise, mostly sunny, with a high near 46. Calm wind.
Tuesday Night
Patchy fog after 9pm. Otherwise, mostly clear, with a low around 16. Calm wind.
Wednesday
Patchy fog before 10am. Otherwise, sunny, with a high near 51.
Wednesday Night
Patchy fog after midnight. Otherwise, partly cloudy, with a low around 21.
Thursday
Patchy fog before 11am. Otherwise, sunny, with a high near 55.
Thursday Night
Mostly clear, with a low around 22.
Friday
Sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 26.
Saturday
Sunny, with a high near 67.
Saturday Night
Partly cloudy, with a low around 28.
Sunday
Sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Garrison MT
 46.51°N 112.81°W (Elev. 4380 ft)
Last Update:
12:22 am MDT Oct 12, 2026
Forecast Valid:
1am MDT Oct 12, 2026-6pm MDT Oct 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation