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 >

Hazardous Weather Conditions

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

37°F

3°C

Humidity 56%
Wind Speed NA 9 MPH
Barometer NA
Dewpoint 23°F (-5°C)
Visibility NA
Wind Chill30°F (-1°C)
Last update 26 Dec 02:10 AM MST
Extended Forecast for

6 Miles W St Mary MT

Winter Weather Advisory December 26, 08:00am until December 27, 02:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Overnight

    Overnight: A 40 percent chance of snow. Mostly cloudy, with a low around 23. Breezy, with a southwest wind around 23 mph, with gusts as high as 34 mph. Total nighttime snow accumulation of 2 to 4 inches possible.

    Low: 23 °F

    Chance Snow
    and Breezy

  • Friday

    Friday: Snow, mainly after 11am. The snow could be heavy at times. High near 27. Windy, with a southwest wind 18 to 23 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 41 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

    High: 27 °F

    Heavy Snow
    then Heavy
    Snow and
    Windy

  • Friday Night

    Friday Night: Snow. The snow could be heavy at times. Low around -7. Wind chill values as low as -15. Windy, with a west southwest wind 21 to 30 mph becoming north northwest after midnight. Winds could gust as high as 41 mph. Chance of precipitation is 90%. New snow accumulation of 4 to 8 inches possible.

    Low: -7 °F

    Heavy Snow
    and Windy

  • Saturday

    Saturday: Snow likely, mainly before 10am. The snow could be heavy at times. Mostly cloudy and cold, with a high near 3. Wind chill values as low as -25. North northeast wind 15 to 20 mph decreasing to 8 to 13 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

    High: 3 °F

    Heavy Snow
    then Chance
    Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around -8. West southwest wind 6 to 11 mph, with gusts as high as 18 mph.

    Low: -8 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 11. West southwest wind 16 to 21 mph, with gusts as high as 32 mph.

    High: 11 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 9. Breezy, with a west southwest wind 22 to 25 mph, with gusts as high as 39 mph.

    Low: 9 °F

    Partly Cloudy
    and Breezy

  • Monday

    Monday: Partly sunny, with a high near 19. Breezy, with a west southwest wind 22 to 26 mph, with gusts as high as 40 mph.

    High: 19 °F

    Partly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 18. Breezy.

    Low: 18 °F

    Mostly Cloudy
    and Breezy

Detailed Forecast

Overnight
A 40 percent chance of snow. Mostly cloudy, with a low around 23. Breezy, with a southwest wind around 23 mph, with gusts as high as 34 mph. Total nighttime snow accumulation of 2 to 4 inches possible.
Friday
Snow, mainly after 11am. The snow could be heavy at times. High near 27. Windy, with a southwest wind 18 to 23 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 41 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.
Friday Night
Snow. The snow could be heavy at times. Low around -7. Wind chill values as low as -15. Windy, with a west southwest wind 21 to 30 mph becoming north northwest after midnight. Winds could gust as high as 41 mph. Chance of precipitation is 90%. New snow accumulation of 4 to 8 inches possible.
Saturday
Snow likely, mainly before 10am. The snow could be heavy at times. Mostly cloudy and cold, with a high near 3. Wind chill values as low as -25. North northeast wind 15 to 20 mph decreasing to 8 to 13 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
Saturday Night
Partly cloudy, with a low around -8. West southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Sunday
Mostly sunny, with a high near 11. West southwest wind 16 to 21 mph, with gusts as high as 32 mph.
Sunday Night
Partly cloudy, with a low around 9. Breezy, with a west southwest wind 22 to 25 mph, with gusts as high as 39 mph.
Monday
Partly sunny, with a high near 19. Breezy, with a west southwest wind 22 to 26 mph, with gusts as high as 40 mph.
Monday Night
Mostly cloudy, with a low around 18. Breezy.
Tuesday
Partly sunny, with a high near 24. Breezy.
Tuesday Night
Mostly cloudy, with a low around 19.
Wednesday
A chance of snow. Mostly cloudy, with a high near 25.
Wednesday Night
A chance of snow. Mostly cloudy, with a low around 18.
New Year's Day
A chance of snow. Mostly cloudy, with a high near 26.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
6 Miles W St Mary MT
 48.75°N 113.57°W (Elev. 6909 ft)
Last Update:
2:46 am MST Dec 26, 2025
Forecast Valid:
3am MST Dec 26, 2025-6pm MST Jan 1, 2026
 
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