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

Helena Regional Airport (KHLN)

Lat: 46.60445°NLon: 111.9892°WElev: 3874.0ft.

Clear

40°F

4°C

Humidity 85%
Wind Speed SW 3 MPH
Barometer 29.73 in (1006.77 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 25 Dec 10:53 AM MST
Extended Forecast for

Helena MT

  • Christmas Day

    Christmas Day: Mostly sunny, with a high near 51. Light south wind becoming south southwest 5 to 9 mph in the afternoon.

    High: 51 °F

    Mostly Sunny

  • Tonight

    Tonight: A 20 percent chance of rain between 3am and 4am. Mostly cloudy, with a low around 31. East southeast wind around 7 mph becoming south southwest after midnight.

    Low: 31 °F

    Slight Chance
    Rain

  • Friday

    Friday: A slight chance of rain and snow before 11am, then a chance of rain. Partly sunny, with a high near 47. Breezy, with a southeast wind 7 to 12 mph becoming west southwest 17 to 22 mph in the morning. Winds could gust as high as 40 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 47 °F

    Chance
    Rain/Snow
    then Chance
    Rain and
    Breezy

  • Friday Night

    Friday Night: A chance of rain and snow before 8pm, then a chance of snow. Mostly cloudy, with a low around 22. Southwest wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Saturday

    Saturday: Snow likely, mainly before 11am. Mostly cloudy, with a high near 31. West southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 31 °F

    Snow Likely
    then Chance
    Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 5. North northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 5 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 30. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 30 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 16. South wind around 6 mph.

    Low: 16 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

Detailed Forecast

Christmas Day
Mostly sunny, with a high near 51. Light south wind becoming south southwest 5 to 9 mph in the afternoon.
Tonight
A 20 percent chance of rain between 3am and 4am. Mostly cloudy, with a low around 31. East southeast wind around 7 mph becoming south southwest after midnight.
Friday
A slight chance of rain and snow before 11am, then a chance of rain. Partly sunny, with a high near 47. Breezy, with a southeast wind 7 to 12 mph becoming west southwest 17 to 22 mph in the morning. Winds could gust as high as 40 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Friday Night
A chance of rain and snow before 8pm, then a chance of snow. Mostly cloudy, with a low around 22. Southwest wind around 10 mph, with gusts as high as 23 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Saturday
Snow likely, mainly before 11am. Mostly cloudy, with a high near 31. West southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Saturday Night
Partly cloudy, with a low around 5. North northwest wind 5 to 8 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 30. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 16. South wind around 6 mph.
Monday
Mostly sunny, with a high near 39.
Monday Night
Mostly cloudy, with a low around 24.
Tuesday
Mostly cloudy, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 27.
Wednesday
Mostly cloudy, with a high near 45.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Helena MT
 46.61°N 111.96°W (Elev. 3796 ft)
Last Update:
10:07 am MST Dec 25, 2025
Forecast Valid:
11am MST Dec 25, 2025-6pm MST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation