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 >

Hazardous Weather Conditions

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

49°F

9°C

Humidity 62%
Wind Speed NA 11 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Wind Chill44°F (7°C)
Last update 20 Mar 08:10 AM MDT
Extended Forecast for

St Mary MT

High Wind Warning until March 21, 12:00pm
Click here for hazard details and duration
High Wind Warning
  •  
    High Wind Warning until March 21, 12:00pm

    NOW until 12:00pm Sat

    High Wind Warning

  • Today

    High: 60 °F

    Rain Likely
    and Windy

  • Tonight

    Tonight: Rain. Low around 45. Windy, with a southwest wind 31 to 36 mph decreasing to 25 to 30 mph after midnight. Winds could gust as high as 55 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 45 °F

    Rain and
    Windy

  • Saturday

    Saturday: Rain and snow likely before 3pm, then a chance of snow. Mostly cloudy, with a high near 49. Breezy, with a west southwest wind 18 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 49 °F

    Rain/Snow
    Likely and
    Breezy then
    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: A 20 percent chance of snow before midnight. Partly cloudy, with a low around 31. West southwest wind 16 to 20 mph, with gusts as high as 28 mph.

    Low: 31 °F

    Slight Chance
    Snow then
    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 43. West southwest wind 9 to 17 mph, with gusts as high as 37 mph.

    High: 43 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 29. West southwest wind 8 to 16 mph, with gusts as high as 37 mph.

    Low: 29 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 47. West southwest wind 7 to 11 mph, with gusts as high as 28 mph.

    High: 47 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31. Southwest wind 6 to 10 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Mostly Cloudy

Detailed Forecast

Today
Rain likely, mainly between 9am and 10am. Partly sunny, with a high near 60. Windy, with a west southwest wind 36 to 38 mph, with gusts as high as 55 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Rain. Low around 45. Windy, with a southwest wind 31 to 36 mph decreasing to 25 to 30 mph after midnight. Winds could gust as high as 55 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Rain and snow likely before 3pm, then a chance of snow. Mostly cloudy, with a high near 49. Breezy, with a west southwest wind 18 to 24 mph, with gusts as high as 33 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Saturday Night
A 20 percent chance of snow before midnight. Partly cloudy, with a low around 31. West southwest wind 16 to 20 mph, with gusts as high as 28 mph.
Sunday
Sunny, with a high near 43. West southwest wind 9 to 17 mph, with gusts as high as 37 mph.
Sunday Night
Partly cloudy, with a low around 29. West southwest wind 8 to 16 mph, with gusts as high as 37 mph.
Monday
Partly sunny, with a high near 47. West southwest wind 7 to 11 mph, with gusts as high as 28 mph.
Monday Night
Mostly cloudy, with a low around 31. Southwest wind 6 to 10 mph, with gusts as high as 25 mph.
Tuesday
A slight chance of snow before noon, then a chance of rain and snow between noon and 3pm, then a chance of rain after 3pm. Mostly cloudy, with a high near 49.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 37.
Wednesday
A chance of rain and snow. Partly sunny, with a high near 46.
Wednesday Night
A chance of snow. Mostly cloudy, with a low around 24.
Thursday
A chance of snow. Partly sunny, with a high near 39.
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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:
4:01 am MDT Mar 20, 2026
Forecast Valid:
8am MDT Mar 20, 2026-6pm MDT Mar 26, 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