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.

Overcast

43°F

6°C

Humidity 76%
Wind Speed ENE 5 MPH
Barometer 29.7 in (1005.76 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 25 Dec 06:53 AM MST
Extended Forecast for

Helena MT

  • Christmas Day

    Christmas Day: Mostly sunny, with a high near 50. South wind 3 to 8 mph. Winds could gust as high as 18 mph.

    High: 50 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of rain and snow before 3am, then a chance of rain between 3am and 5am, then a chance of rain and snow after 5am. Mostly cloudy, with a low around 33. South wind 6 to 8 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 33 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Friday

    Friday: A chance of rain and snow before 11am, then a chance of rain between 11am and 2pm, then a chance of rain and snow after 2pm. Partly sunny, with a high near 47. South wind 6 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

    High: 47 °F

    Chance
    Rain/Snow

  • Friday Night

    Friday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 24. Southwest wind around 10 mph, with gusts as high as 24 mph. New snow accumulation of less than a half inch possible.

    Low: 24 °F

    Chance Snow

  • Saturday

    Saturday: Snow likely, mainly before 11am. Mostly cloudy, with a high near 31. West southwest wind around 11 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 31 °F

    Snow Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 8. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 8 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 29. South southwest wind 3 to 6 mph.

    High: 29 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18. South southwest wind around 6 mph.

    Low: 18 °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 50. South wind 3 to 8 mph. Winds could gust as high as 18 mph.
Tonight
A chance of rain and snow before 3am, then a chance of rain between 3am and 5am, then a chance of rain and snow after 5am. Mostly cloudy, with a low around 33. South wind 6 to 8 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Friday
A chance of rain and snow before 11am, then a chance of rain between 11am and 2pm, then a chance of rain and snow after 2pm. Partly sunny, with a high near 47. South wind 6 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Friday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 24. Southwest wind around 10 mph, with gusts as high as 24 mph. 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 around 11 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Saturday Night
Partly cloudy, with a low around 8. North northwest wind 5 to 7 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 29. South southwest wind 3 to 6 mph.
Sunday Night
Partly cloudy, with a low around 18. South southwest wind around 6 mph.
Monday
Mostly sunny, with a high near 39.
Monday Night
Mostly cloudy, with a low around 27.
Tuesday
Mostly cloudy, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
Mostly cloudy, with a high near 46.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Helena MT
 46.58°N 112.01°W (Elev. 4111 ft)
Last Update:
5:07 am MST Dec 25, 2025
Forecast Valid:
7am MST Dec 25, 2025-6pm MST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation