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

46°F

8°C

Humidity 77%
Wind Speed NA 7 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Wind Chill42°F (6°C)
Last update 20 Mar 06:10 PM MDT
Extended Forecast for

St Mary MT

High Wind Warning March 20, 07:02pm until March 21, 12:00pm
Click here for hazard details and duration
High Wind Warning
  •  
    High Wind Warning March 20, 07:02pm until March 21, 12:00pm

    NOW until 12:00pm Sat

    High Wind Warning

  • Tonight

    Low: 44 °F

    Rain Likely
    and Windy

  • Saturday

    Saturday: A chance of rain before 9am, then a slight chance of rain and snow. Partly sunny, with a temperature falling to around 41 by 5pm. Breezy, with a west wind 13 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

    High: 45 °F⇓

    Chance
    Rain/Snow and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 29. Southwest wind 13 to 16 mph, with gusts as high as 24 mph.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 45. Breezy, with a west southwest wind 17 to 26 mph, with gusts as high as 40 mph.

    High: 45 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 29. Breezy, with a west southwest wind 21 to 26 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 37 mph.

    Low: 29 °F

    Partly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 48. West southwest wind 7 to 10 mph, with gusts as high as 24 mph.

    High: 48 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 30. Southwest wind 6 to 10 mph, with gusts as high as 23 mph.

    Low: 30 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of snow before 3pm, then a chance of rain. Mostly cloudy, with a high near 48. Southwest wind 5 to 14 mph, with gusts as high as 30 mph.

    High: 48 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

Detailed Forecast

Tonight
Rain likely, mainly before midnight. Mostly cloudy, with a low around 44. Windy, with a southwest wind 24 to 32 mph, with gusts as high as 47 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
A chance of rain before 9am, then a slight chance of rain and snow. Partly sunny, with a temperature falling to around 41 by 5pm. Breezy, with a west wind 13 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Saturday Night
Mostly clear, with a low around 29. Southwest wind 13 to 16 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 45. Breezy, with a west southwest wind 17 to 26 mph, with gusts as high as 40 mph.
Sunday Night
Partly cloudy, with a low around 29. Breezy, with a west southwest wind 21 to 26 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 37 mph.
Monday
Mostly sunny, with a high near 48. West southwest wind 7 to 10 mph, with gusts as high as 24 mph.
Monday Night
Mostly cloudy, with a low around 30. Southwest wind 6 to 10 mph, with gusts as high as 23 mph.
Tuesday
A chance of snow before 3pm, then a chance of rain. Mostly cloudy, with a high near 48. Southwest wind 5 to 14 mph, with gusts as high as 30 mph.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 37.
Wednesday
A chance of rain and snow before 3pm, then a chance of snow. Partly sunny, with a high near 45.
Wednesday Night
A chance of rain and snow. Mostly cloudy, with a low around 25.
Thursday
A slight chance of snow. Partly sunny, with a high near 39.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Sunny, with a high near 46.
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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:
6:32 pm MDT Mar 20, 2026
Forecast Valid:
7pm MDT Mar 20, 2026-6pm MDT Mar 27, 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