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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

30°F

-1°C

Humidity 80%
Wind Speed NA 3 MPH
Barometer NA
Dewpoint 24°F (-4°C)
Visibility NA
Last update 21 Mar 06:10 PM MDT
Extended Forecast for

St Mary MT

  • Tonight

    Tonight: Partly cloudy, with a low around 27. West northwest wind 7 to 13 mph becoming south southwest in the evening. Winds could gust as high as 29 mph.

    Low: 27 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 42. West southwest wind 10 to 14 mph, with gusts as high as 32 mph.

    High: 42 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 27. West southwest wind 6 to 13 mph, with gusts as high as 29 mph.

    Low: 27 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 48. West southwest wind 5 to 10 mph, with gusts as high as 23 mph.

    High: 48 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Snow likely before 3pm, then rain likely, possibly mixed with snow. Mostly cloudy, with a high near 45. Southwest wind 5 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 45 °F

    Chance Snow
    then
    Rain/Snow
    Likely

  • Tuesday Night

    Tuesday Night: A chance of rain before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 34. Southwest wind 11 to 16 mph, with gusts as high as 37 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

    Low: 34 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A chance of rain and snow before 9am, then a chance of snow. Partly sunny, with a high near 44. West southwest wind 16 to 21 mph, with gusts as high as 44 mph.

    High: 44 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A chance of snow. Mostly cloudy, with a low around 23.

    Low: 23 °F

    Chance Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 27. West northwest wind 7 to 13 mph becoming south southwest in the evening. Winds could gust as high as 29 mph.
Sunday
Sunny, with a high near 42. West southwest wind 10 to 14 mph, with gusts as high as 32 mph.
Sunday Night
Partly cloudy, with a low around 27. West southwest wind 6 to 13 mph, with gusts as high as 29 mph.
Monday
Mostly sunny, with a high near 48. West southwest wind 5 to 10 mph, with gusts as high as 23 mph.
Monday Night
Mostly cloudy, with a low around 31. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.
Tuesday
Snow likely before 3pm, then rain likely, possibly mixed with snow. Mostly cloudy, with a high near 45. Southwest wind 5 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Tuesday Night
A chance of rain before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 34. Southwest wind 11 to 16 mph, with gusts as high as 37 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
Wednesday
A chance of rain and snow before 9am, then a chance of snow. Partly sunny, with a high near 44. West southwest wind 16 to 21 mph, with gusts as high as 44 mph.
Wednesday Night
A chance of snow. Mostly cloudy, with a low around 23.
Thursday
A chance of snow, mainly after noon. Partly sunny, with a high near 39.
Thursday Night
Mostly clear, with a low around 23.
Friday
Sunny, with a high near 43.
Friday Night
Mostly clear, with a low around 25.
Saturday
Mostly sunny, with a high near 49.
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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:
6:36 pm MDT Mar 21, 2026
Forecast Valid:
6pm MDT Mar 21, 2026-6pm MDT Mar 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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