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

Storm Moving from Western into Central U.S. through Wednesday

A storm system moving over the Rockies Wednesday will bring marginal risks for excessive rainfall and severe thunderstorms from parts of New Mexico into western South Dakota. Moderate snow is expected from northwestern Wyoming into southern Montana. Read More >

Current conditions at

ST. MARY (SRYM8)

Lat: 48.74108°NLon: 113.43289°WElev: 4557.0ft.

NA

28°F

-2°C

Humidity 96%
Wind Speed SE 2 MPH
Barometer NA
Dewpoint 27°F (-3°C)
Visibility NA
Last update 15 Oct 03:11 AM MDT
Extended Forecast for

St Mary MT

  • Today

    Today: Patchy fog before 9am. Otherwise, sunny, with a high near 54. Light and variable wind.

    High: 54 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 28. Calm wind becoming west northwest around 5 mph after midnight.

    Low: 28 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 53. West southwest wind 5 to 9 mph, with gusts as high as 18 mph.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 31. West southwest wind 10 to 16 mph, with gusts as high as 36 mph.

    Low: 31 °F

    Partly Cloudy

  • Friday

    Friday: A chance of rain before 9am, then a chance of rain and snow between 9am and noon, then a chance of rain after noon. Partly sunny, with a high near 47. West southwest wind around 11 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

    High: 47 °F

    Chance
    Rain/Snow
    then Chance
    Rain

  • Friday Night

    Friday Night: A chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 28. West southwest wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 28 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 48. West southwest wind 8 to 14 mph, with gusts as high as 25 mph.

    High: 48 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of rain, mainly after midnight. Mostly cloudy, with a low around 35. West southwest wind 11 to 14 mph, with gusts as high as 32 mph.

    Low: 35 °F

    Chance Rain

  • Sunday

    Sunday: Rain likely. Mostly cloudy, with a high near 52.

    High: 52 °F

    Rain Likely

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, sunny, with a high near 54. Light and variable wind.
Tonight
Partly cloudy, with a low around 28. Calm wind becoming west northwest around 5 mph after midnight.
Thursday
Sunny, with a high near 53. West southwest wind 5 to 9 mph, with gusts as high as 18 mph.
Thursday Night
Partly cloudy, with a low around 31. West southwest wind 10 to 16 mph, with gusts as high as 36 mph.
Friday
A chance of rain before 9am, then a chance of rain and snow between 9am and noon, then a chance of rain after noon. Partly sunny, with a high near 47. West southwest wind around 11 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
Friday Night
A chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 28. West southwest wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Saturday
Mostly sunny, with a high near 48. West southwest wind 8 to 14 mph, with gusts as high as 25 mph.
Saturday Night
A chance of rain, mainly after midnight. Mostly cloudy, with a low around 35. West southwest wind 11 to 14 mph, with gusts as high as 32 mph.
Sunday
Rain likely. Mostly cloudy, with a high near 52.
Sunday Night
A chance of rain before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 31.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 45.
Monday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 27.
Tuesday
Partly sunny, with a high near 45.
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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:
2:10 am MDT Oct 15, 2025
Forecast Valid:
4am MDT Oct 15, 2025-6pm MDT Oct 21, 2025
 
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Additional Resources

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Chance of Precipitation