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

HELENA (HRWM8)

Lat: 46.73167°NLon: 112.01917°WElev: 3800.0ft.

NA

40°F

4°C

Humidity 82%
Wind Speed NNW 3 MPH
Barometer NA
Dewpoint 35°F (2°C)
Visibility NA
Last update 24 Dec 09:53 PM MST
Extended Forecast for

14 Miles NNE Helena MT

Winter Weather Advisory December 24, 10:12pm until December 25, 05:00am
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory December 24, 10:12pm until December 25, 05:00am

    NOW until 5:00am Thu

    Winter Weather Advisory

  • Tonight

    Low: 36 °F

    Cloudy

  • Christmas Day

    Christmas Day: Mostly cloudy, then gradually becoming sunny, with a high near 50. South southeast wind 5 to 10 mph, with gusts as high as 18 mph.

    High: 50 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 33. Southeast wind 7 to 9 mph.

    Low: 33 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 45. South southwest wind 7 to 15 mph, with gusts as high as 25 mph.

    High: 45 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 20. West southwest wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 20 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 25. West wind 11 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 25 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 6. North wind 5 to 8 mph becoming light and variable in the evening.

    Low: 6 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 31. South wind 6 to 10 mph.

    High: 31 °F

    Sunny

Detailed Forecast

Tonight
Cloudy, with a low around 36. South southeast wind around 6 mph.
Christmas Day
Mostly cloudy, then gradually becoming sunny, with a high near 50. South southeast wind 5 to 10 mph, with gusts as high as 18 mph.
Thursday Night
Mostly cloudy, with a low around 33. Southeast wind 7 to 9 mph.
Friday
Partly sunny, with a high near 45. South southwest wind 7 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 20. West southwest wind 10 to 13 mph, with gusts as high as 22 mph.
Saturday
Partly sunny, with a high near 25. West wind 11 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
Partly cloudy, with a low around 6. North wind 5 to 8 mph becoming light and variable in the evening.
Sunday
Sunny, with a high near 31. South wind 6 to 10 mph.
Sunday Night
Partly cloudy, with a low around 19.
Monday
Mostly sunny, with a high near 39.
Monday Night
Partly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 28.
Wednesday
Partly sunny, with a high near 44.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
14 Miles NNE Helena MT
 46.81°N 111.9°W (Elev. 3950 ft)
Last Update:
9:43 pm MST Dec 24, 2025
Forecast Valid:
10pm MST Dec 24, 2025-6pm MST Dec 31, 2025
 
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Additional Resources

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