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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

17°F

-8°C

Humidity 86%
Wind Speed NA 0 MPH
Barometer NA
Dewpoint 13°F (-11°C)
Visibility NA
Last update 24 Dec 08:10 AM MST
Extended Forecast for

5 Miles WSW St Mary MT

  • Today

    Today: Snow likely, mainly after 5pm. Mostly sunny, with a high near 30. Southwest wind 7 to 10 mph. Chance of precipitation is 60%. Total daytime snow accumulation of less than a half inch possible.

    High: 30 °F

    Mostly Sunny
    then Snow
    Likely

  • Tonight

    Tonight: Snow likely, mainly before 11pm. Mostly cloudy, with a low around 22. West wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    Low: 22 °F

    Snow Likely
    then Slight
    Chance Snow

  • Christmas Day

    Christmas Day: A 20 percent chance of snow before 11am. Mostly sunny, with a high near 34. West southwest wind 14 to 16 mph, with gusts as high as 26 mph.

    High: 34 °F

    Slight Chance
    Snow then
    Mostly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 26. Breezy, with a west southwest wind 15 to 22 mph, with gusts as high as 38 mph. New snow accumulation of less than one inch possible.

    Low: 26 °F

    Chance Snow
    and Breezy

  • Friday

    Friday: Snow likely, mainly after 11am. Mostly cloudy, with a high near 27. Breezy, with a west southwest wind 23 to 28 mph, with gusts as high as 49 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.

    High: 27 °F

    Snow Likely
    and Breezy

  • Friday Night

    Friday Night: Snow. Low around -2. Breezy, with a west southwest wind 23 to 28 mph, with gusts as high as 50 mph. Chance of precipitation is 90%. New snow accumulation of 4 to 8 inches possible.

    Low: -2 °F

    Snow and
    Breezy

  • Saturday

    Saturday: A 50 percent chance of snow, mainly before 11am. Mostly cloudy and cold, with a high near 4. North wind 10 to 20 mph, with gusts as high as 33 mph. New snow accumulation of less than one inch possible.

    High: 4 °F

    Chance Snow
    then Slight
    Chance Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 2. West southwest wind 9 to 14 mph increasing to 16 to 21 mph in the evening. Winds could gust as high as 34 mph.

    Low: 2 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 18. Breezy.

    High: 18 °F

    Mostly Cloudy
    and Breezy

Detailed Forecast

Today
Snow likely, mainly after 5pm. Mostly sunny, with a high near 30. Southwest wind 7 to 10 mph. Chance of precipitation is 60%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Snow likely, mainly before 11pm. Mostly cloudy, with a low around 22. West wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Christmas Day
A 20 percent chance of snow before 11am. Mostly sunny, with a high near 34. West southwest wind 14 to 16 mph, with gusts as high as 26 mph.
Thursday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 26. Breezy, with a west southwest wind 15 to 22 mph, with gusts as high as 38 mph. New snow accumulation of less than one inch possible.
Friday
Snow likely, mainly after 11am. Mostly cloudy, with a high near 27. Breezy, with a west southwest wind 23 to 28 mph, with gusts as high as 49 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.
Friday Night
Snow. Low around -2. Breezy, with a west southwest wind 23 to 28 mph, with gusts as high as 50 mph. Chance of precipitation is 90%. New snow accumulation of 4 to 8 inches possible.
Saturday
A 50 percent chance of snow, mainly before 11am. Mostly cloudy and cold, with a high near 4. North wind 10 to 20 mph, with gusts as high as 33 mph. New snow accumulation of less than one inch possible.
Saturday Night
Mostly cloudy, with a low around 2. West southwest wind 9 to 14 mph increasing to 16 to 21 mph in the evening. Winds could gust as high as 34 mph.
Sunday
Mostly cloudy, with a high near 18. Breezy.
Sunday Night
Mostly cloudy, with a low around 16. Breezy.
Monday
Mostly cloudy, with a high near 25. Breezy.
Monday Night
Mostly cloudy, with a low around 21. Breezy.
Tuesday
A slight chance of snow. Partly sunny, with a high near 29. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW St Mary MT
 48.73°N 113.53°W (Elev. 6778 ft)
Last Update:
7:53 am MST Dec 24, 2025
Forecast Valid:
9am MST Dec 24, 2025-6pm MST Dec 30, 2025
 
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