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

Tracking Areas of Fire Weather, Winter Weather, and Severe Weather Thursday

Continuation of gusty winds and low relative humidity will bring additional periods of critical fire weather to the southern Plains Thursday and Friday. Another Pacific storm will continue gusty winds and heavy snow over the western mountains into Thursday. Severe thunderstorms are possible across parts of the middle Mississippi into lower Ohio Valleys Thursday afternoon into early evening. Read More >

Hazardous Weather Conditions

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

Lat: 48.74111°NLon: 113.43306°WElev: 4550.0ft.

NA

-12°F

-24°C

Humidity 70%
Wind Speed NA 1 MPH
Barometer NA
Dewpoint -19°F (-28°C)
Visibility NA
Last update 18 Feb 10:10 PM MST
Extended Forecast for

St Mary MT

Cold Weather Advisory until February 19, 12:00pm
Winter Weather Advisory February 18, 10:50pm until February 18, 11:00pm
Click here for hazard details and duration
Cold Weather Advisory
...
  •  
    Cold Weather Advisory until February 19, 12:00pm
    Winter Weather Advisory February 18, 10:50pm until February 18, 11:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: -14 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 21. Wind chill values as low as -25. Calm wind becoming east around 5 mph in the afternoon.

    High: 21 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 8. Wind chill values as low as zero. South southwest wind around 6 mph.

    Low: 8 °F

    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of snow. Partly sunny, with a high near 27. West southwest wind 6 to 8 mph. Little or no snow accumulation expected.

    High: 27 °F

    Chance Snow

  • Friday Night

    Friday Night: A 20 percent chance of snow before 11pm. Mostly cloudy, with a low around 14. West southwest wind around 7 mph.

    Low: 14 °F

    Slight Chance
    Snow then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 30. Light and variable wind becoming east around 6 mph in the afternoon.

    High: 30 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after 11pm. Mostly cloudy, with a low around 10. East wind around 6 mph becoming light and variable after midnight.

    Low: 10 °F

    Slight Chance
    Snow

  • Sunday

    Sunday: A slight chance of snow. Partly sunny, with a high near 31. Southeast wind 5 to 7 mph.

    High: 31 °F

    Slight Chance
    Snow

Detailed Forecast

Tonight
Mostly cloudy, with a low around -14. Wind chill values as low as -30. Northeast wind around 6 mph becoming calm after midnight.
Thursday
Sunny, with a high near 21. Wind chill values as low as -25. Calm wind becoming east around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 8. Wind chill values as low as zero. South southwest wind around 6 mph.
Friday
A 40 percent chance of snow. Partly sunny, with a high near 27. West southwest wind 6 to 8 mph. Little or no snow accumulation expected.
Friday Night
A 20 percent chance of snow before 11pm. Mostly cloudy, with a low around 14. West southwest wind around 7 mph.
Saturday
Mostly sunny, with a high near 30. Light and variable wind becoming east around 6 mph in the afternoon.
Saturday Night
A 20 percent chance of snow after 11pm. Mostly cloudy, with a low around 10. East wind around 6 mph becoming light and variable after midnight.
Sunday
A slight chance of snow. Partly sunny, with a high near 31. Southeast wind 5 to 7 mph.
Sunday Night
A slight chance of snow. Mostly cloudy, with a low around 16.
Monday
A chance of snow, mainly after 11am. Partly sunny, with a high near 41.
Monday Night
Snow likely. Mostly cloudy, with a low around 24.
Tuesday
A chance of snow. Partly sunny, with a high near 36.
Tuesday Night
A chance of snow. Mostly cloudy, with a low around 27.
Wednesday
A slight chance of snow. Partly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
St Mary MT
 48.74°N 113.44°W (Elev. 4554 ft)
Last Update:
10:17 pm MST Feb 18, 2026
Forecast Valid:
10pm MST Feb 18, 2026-6pm MST Feb 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation