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

Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Current conditions at

Garrison I-90 MP 174.4 (MTGAR)

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

unknown precip

61°F

16°C

Humidity 89%
Wind Speed NE 4 MPH
Barometer NA
Dewpoint 58°F (14°C)
Visibility NA
Last update 16 Aug 10:00 PM MDT
Extended Forecast for

6 Miles NNW Garrison MT

  • Tonight

    Tonight: A 20 percent chance of showers before midnight. Areas of smoke before midnight. Mostly cloudy, with a low around 50. North northwest wind around 5 mph becoming calm in the evening.

    Low: 50 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 76. Calm wind becoming west northwest around 6 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 49. South southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 49 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52. West wind around 6 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers before midnight. Areas of smoke before midnight. Mostly cloudy, with a low around 50. North northwest wind around 5 mph becoming calm in the evening.
Sunday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 76. Calm wind becoming west northwest around 6 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 49. South southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Monday
Sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the afternoon.
Monday Night
Mostly clear, with a low around 52. West wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 90.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 82.
Thursday Night
Mostly clear, with a low around 46.
Friday
Sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 45.
Saturday
Sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
6 Miles NNW Garrison MT
 46.6°N 112.85°W (Elev. 4766 ft)
Last Update:
6:20 pm MDT Aug 16, 2025
Forecast Valid:
10pm MDT Aug 16, 2025-6pm MDT Aug 23, 2025
 
Forecast Discussion
 
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Additional Resources

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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