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

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

45°F

7°C

Humidity 40%
Wind Speed NA 9 MPH
Barometer NA
Dewpoint 22°F (-6°C)
Visibility NA
Wind Chill40°F (4°C)
Last update 18 Apr 05:10 PM MDT
Extended Forecast for

St Mary MT

  • Tonight

    Tonight: Mostly clear, with a low around 32. South southwest wind 6 to 8 mph, with gusts as high as 18 mph.

    Low: 32 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 41. West southwest wind 7 to 9 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 66. West southwest wind 3 to 8 mph.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 44. Southwest wind 5 to 8 mph, with gusts as high as 20 mph.

    Low: 44 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 71. Southwest wind 5 to 7 mph.

    High: 71 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 42. West southwest wind 3 to 6 mph.

    Low: 42 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: A chance of rain, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 54. North northwest wind 6 to 13 mph, with gusts as high as 25 mph.

    High: 54 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Rain and snow, becoming all snow after midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Rain/Snow
    then Snow
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 32. South southwest wind 6 to 8 mph, with gusts as high as 18 mph.
Sunday
Sunny, with a high near 58. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 41. West southwest wind 7 to 9 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 66. West southwest wind 3 to 8 mph.
Monday Night
Partly cloudy, with a low around 44. Southwest wind 5 to 8 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 71. Southwest wind 5 to 7 mph.
Tuesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 42. West southwest wind 3 to 6 mph.
Wednesday
A chance of rain, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 54. North northwest wind 6 to 13 mph, with gusts as high as 25 mph.
Wednesday Night
Rain and snow, becoming all snow after midnight. Mostly cloudy, with a low around 27.
Thursday
A chance of snow. Partly sunny, with a high near 40.
Thursday Night
A slight chance of snow. Mostly cloudy, with a low around 24.
Friday
A slight chance of snow. Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 25.
Saturday
A slight chance of rain and snow. Mostly sunny, with a high near 46.
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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:
2:12 pm MDT Apr 18, 2026
Forecast Valid:
6pm MDT Apr 18, 2026-6pm MDT Apr 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation