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

Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. 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

16°F

-9°C

Humidity 58%
Wind Speed NA 14 MPH
Barometer NA
Dewpoint 3°F (-16°C)
Visibility NA
Wind Chill2°F (-17°C)
Last update 28 Dec 10:10 AM MST
Extended Forecast for

St Mary MT

  • Today

    Today: Sunny, with a high near 22. Wind chill values as low as -5. Southwest wind 16 to 21 mph, with gusts as high as 29 mph.

    High: 22 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 16. Wind chill values as low as zero. Breezy, with a southwest wind 22 to 24 mph, with gusts as high as 33 mph.

    Low: 16 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: Partly sunny, with a high near 26. Breezy, with a southwest wind 20 to 22 mph, with gusts as high as 31 mph.

    High: 26 °F

    Partly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 25. West southwest wind 16 to 20 mph, with gusts as high as 30 mph.

    Low: 25 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 37. West southwest wind 10 to 14 mph, with gusts as high as 25 mph.

    High: 37 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 30. West southwest wind around 14 mph, with gusts as high as 25 mph.

    Low: 30 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 40. West southwest wind around 11 mph, with gusts as high as 23 mph.

    High: 40 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29. West southwest wind around 10 mph, with gusts as high as 21 mph.

    Low: 29 °F

    Mostly Cloudy

  • New Year's Day

    New Year's Day: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 22. Wind chill values as low as -5. Southwest wind 16 to 21 mph, with gusts as high as 29 mph.
Tonight
Partly cloudy, with a low around 16. Wind chill values as low as zero. Breezy, with a southwest wind 22 to 24 mph, with gusts as high as 33 mph.
Monday
Partly sunny, with a high near 26. Breezy, with a southwest wind 20 to 22 mph, with gusts as high as 31 mph.
Monday Night
Mostly cloudy, with a low around 25. West southwest wind 16 to 20 mph, with gusts as high as 30 mph.
Tuesday
Mostly sunny, with a high near 37. West southwest wind 10 to 14 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 30. West southwest wind around 14 mph, with gusts as high as 25 mph.
Wednesday
Partly sunny, with a high near 40. West southwest wind around 11 mph, with gusts as high as 23 mph.
Wednesday Night
Mostly cloudy, with a low around 29. West southwest wind around 10 mph, with gusts as high as 21 mph.
New Year's Day
Partly sunny, with a high near 41.
Thursday Night
Mostly cloudy, with a low around 30.
Friday
A chance of snow. Partly sunny, with a high near 40.
Friday Night
A chance of snow. Mostly cloudy, with a low around 24.
Saturday
A slight chance of snow. Partly sunny, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St Mary MT
 48.74°N 113.44°W (Elev. 4554 ft)
Last Update:
9:56 am MST Dec 28, 2025
Forecast Valid:
10am MST Dec 28, 2025-6pm MST Jan 3, 2026
 
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