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

37°F

3°C

Humidity 86%
Wind Speed SW 3 MPH
Barometer 29.78 in (1008.47 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 24 Dec 12:05 PM MST
Extended Forecast for

Helena MT

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 41. East southeast wind 8 to 10 mph, with gusts as high as 18 mph.

    High: 41 °F

    Partly Sunny

  • Tonight

    Tonight: Rain likely, mainly between 11pm and 3am. Cloudy, with a steady temperature around 38. Southeast wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 70%.

    Low: 38 °F

    Rain Likely

  • Christmas Day

    Christmas Day: A 40 percent chance of rain before 11am. Patchy fog between 10am and 11am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 49. Calm wind becoming south around 6 mph in the afternoon.

    High: 49 °F

    Chance Rain
    and Patchy
    Fog then
    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 32. South wind around 8 mph.

    Low: 32 °F

    Slight Chance
    Rain

  • 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. Mostly cloudy, with a high near 46. South wind 7 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 46 °F

    Chance
    Rain/Snow

  • Friday Night

    Friday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 22. West southwest wind around 14 mph, with gusts as high as 26 mph. Little or no snow accumulation expected.

    Low: 22 °F

    Chance Snow

  • Saturday

    Saturday: A 30 percent chance of snow before 11am. Partly sunny, with a high near 29. West wind 11 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 25 mph. Little or no snow accumulation expected.

    High: 29 °F

    Chance Snow
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 14. North northwest wind 5 to 7 mph becoming light and variable after midnight.

    Low: 14 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 41. East southeast wind 8 to 10 mph, with gusts as high as 18 mph.
Tonight
Rain likely, mainly between 11pm and 3am. Cloudy, with a steady temperature around 38. Southeast wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 70%.
Christmas Day
A 40 percent chance of rain before 11am. Patchy fog between 10am and 11am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 49. Calm wind becoming south around 6 mph in the afternoon.
Thursday Night
A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 32. South wind around 8 mph.
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. Mostly cloudy, with a high near 46. South wind 7 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Friday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 22. West southwest wind around 14 mph, with gusts as high as 26 mph. Little or no snow accumulation expected.
Saturday
A 30 percent chance of snow before 11am. Partly sunny, with a high near 29. West wind 11 to 14 mph becoming north northwest in the afternoon. Winds could gust as high as 25 mph. Little or no snow accumulation expected.
Saturday Night
Mostly cloudy, with a low around 14. North northwest wind 5 to 7 mph becoming light and variable after midnight.
Sunday
Partly sunny, with a high near 35.
Sunday Night
Partly cloudy, with a low around 21.
Monday
Partly sunny, with a high near 42.
Monday Night
Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, 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 111.99°W (Elev. 3878 ft)
Last Update:
9:22 am MST Dec 24, 2025
Forecast Valid:
12pm MST Dec 24, 2025-6pm MST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation