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

39°F

4°C

Humidity 77%
Wind Speed NA 0 MPH
Barometer NA
Dewpoint 32°F (0°C)
Visibility NA
Last update 12 Apr 10:10 PM MDT
Extended Forecast for

St Mary MT

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Patchy Fog

  • Monday

    Monday: A slight chance of showers and thunderstorms, then a chance of rain after 3pm. Partly sunny, with a high near 54. Light and variable wind becoming west southwest 6 to 11 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 40%.

    High: 54 °F

    Partly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 36. West southwest wind 13 to 15 mph, with gusts as high as 32 mph.

    Low: 36 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 45. West southwest wind 16 to 18 mph, with gusts as high as 39 mph.

    High: 45 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 33. West southwest wind 15 to 17 mph, with gusts as high as 38 mph. Little or no snow accumulation expected.

    Low: 33 °F

    Mostly Cloudy
    then Chance
    Snow

  • Wednesday

    Wednesday: A 50 percent chance of snow. Partly sunny, with a high near 44. West southwest wind 14 to 16 mph, with gusts as high as 36 mph. New snow accumulation of less than a half inch possible.

    High: 44 °F

    Chance Snow

  • Wednesday Night

    Wednesday Night: Snow likely. Mostly cloudy, with a low around 21. West southwest wind 10 to 14 mph becoming northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.

    Low: 21 °F

    Snow Likely

  • Thursday

    Thursday: Snow likely, mainly before noon. Mostly cloudy, with a high near 36. North northwest wind 9 to 11 mph, with gusts as high as 23 mph.

    High: 36 °F

    Snow Likely

  • Thursday Night

    Thursday Night: A slight chance of snow before midnight. Partly cloudy, with a low around 22.

    Low: 22 °F

    Slight Chance
    Snow then
    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 34. Calm wind.
Monday
A slight chance of showers and thunderstorms, then a chance of rain after 3pm. Partly sunny, with a high near 54. Light and variable wind becoming west southwest 6 to 11 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 40%.
Monday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 36. West southwest wind 13 to 15 mph, with gusts as high as 32 mph.
Tuesday
Partly sunny, with a high near 45. West southwest wind 16 to 18 mph, with gusts as high as 39 mph.
Tuesday Night
A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 33. West southwest wind 15 to 17 mph, with gusts as high as 38 mph. Little or no snow accumulation expected.
Wednesday
A 50 percent chance of snow. Partly sunny, with a high near 44. West southwest wind 14 to 16 mph, with gusts as high as 36 mph. New snow accumulation of less than a half inch possible.
Wednesday Night
Snow likely. Mostly cloudy, with a low around 21. West southwest wind 10 to 14 mph becoming northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.
Thursday
Snow likely, mainly before noon. Mostly cloudy, with a high near 36. North northwest wind 9 to 11 mph, with gusts as high as 23 mph.
Thursday Night
A slight chance of snow before midnight. Partly cloudy, with a low around 22.
Friday
A chance of snow after noon. Mostly sunny, with a high near 43.
Friday Night
A slight chance of snow. Partly cloudy, with a low around 27.
Saturday
A slight chance of snow. Mostly sunny, with a high near 47.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Mostly sunny, with a high near 53.
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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:
9:37 pm MDT Apr 12, 2026
Forecast Valid:
11pm MDT Apr 12, 2026-6pm MDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation