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

28°F

-2°C

Humidity 89%
Wind Speed NA 3 MPH
Barometer NA
Dewpoint 26°F (-3°C)
Visibility NA
Last update 25 Dec 12:10 AM MST
Extended Forecast for

6 Miles W St Mary MT

  • Overnight

    Overnight: Snow likely, mainly before 2am. Patchy freezing fog before 2am. Mostly cloudy, with a low around 23. West southwest wind 15 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.

    Low: 23 °F

    Snow Likely
    and Patchy
    Freezing Fog

  • Christmas Day

    Christmas Day: A 20 percent chance of snow after 4pm. Mostly sunny, with a high near 30. Southwest wind 16 to 18 mph, with gusts as high as 33 mph.

    High: 30 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 25. Southwest wind around 21 mph, with gusts as high as 37 mph. New snow accumulation of 1 to 3 inches possible.

    Low: 25 °F

    Chance Snow

  • Friday

    Friday: Snow likely, mainly after 11am. Mostly cloudy, with a high near 26. Breezy, with a west southwest wind around 23 mph, with gusts as high as 41 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

    High: 26 °F

    Snow Likely
    and Breezy

  • Friday Night

    Friday Night: Snow. The snow could be heavy at times. Low around -4. Breezy, with a southwest wind 21 to 25 mph, with gusts as high as 45 mph. Chance of precipitation is 90%. New snow accumulation of 4 to 8 inches possible.

    Low: -4 °F

    Heavy Snow
    and Breezy

  • Saturday

    Saturday: Snow, mainly before 11am. High near 3. North wind 8 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 3 °F

    Snow then
    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around -2. Northwest wind 6 to 16 mph becoming southwest in the evening. Winds could gust as high as 25 mph.

    Low: -2 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 14. Breezy, with a west southwest wind 20 to 22 mph, with gusts as high as 36 mph.

    High: 14 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13. Breezy.

    Low: 13 °F

    Mostly Cloudy
    and Breezy

Detailed Forecast

Overnight
Snow likely, mainly before 2am. Patchy freezing fog before 2am. Mostly cloudy, with a low around 23. West southwest wind 15 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.
Christmas Day
A 20 percent chance of snow after 4pm. Mostly sunny, with a high near 30. Southwest wind 16 to 18 mph, with gusts as high as 33 mph.
Thursday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 25. Southwest wind around 21 mph, with gusts as high as 37 mph. New snow accumulation of 1 to 3 inches possible.
Friday
Snow likely, mainly after 11am. Mostly cloudy, with a high near 26. Breezy, with a west southwest wind around 23 mph, with gusts as high as 41 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
Friday Night
Snow. The snow could be heavy at times. Low around -4. Breezy, with a southwest wind 21 to 25 mph, with gusts as high as 45 mph. Chance of precipitation is 90%. New snow accumulation of 4 to 8 inches possible.
Saturday
Snow, mainly before 11am. High near 3. North wind 8 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Saturday Night
Partly cloudy, with a low around -2. Northwest wind 6 to 16 mph becoming southwest in the evening. Winds could gust as high as 25 mph.
Sunday
Mostly sunny, with a high near 14. Breezy, with a west southwest wind 20 to 22 mph, with gusts as high as 36 mph.
Sunday Night
Mostly cloudy, with a low around 13. Breezy.
Monday
Partly sunny, with a high near 23. Breezy.
Monday Night
Mostly cloudy, with a low around 19. Breezy.
Tuesday
Mostly cloudy, with a high near 26. Breezy.
Tuesday Night
Mostly cloudy, with a low around 22.
Wednesday
A slight chance of snow. Partly sunny, with a high near 28.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
6 Miles W St Mary MT
 48.75°N 113.57°W (Elev. 6909 ft)
Last Update:
10:42 pm MST Dec 24, 2025
Forecast Valid:
12am MST Dec 25, 2025-6pm MST Dec 31, 2025
 
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Additional Resources

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