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

34°F

1°C

Humidity 80%
Wind Speed NNW 3 MPH
Barometer 29.69 in (1005.42 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 26 Dec 02:05 AM MST
Extended Forecast for

Helena MT

  • Overnight

    Overnight: A slight chance of rain showers before 5am, then a slight chance of rain and snow showers. Mostly cloudy, with a low around 34. South wind around 7 mph. Chance of precipitation is 20%.

    Low: 34 °F

    Slight Chance
    Rain/Snow

  • Friday

    Friday: A slight chance of snow before 11am, then a chance of rain and snow between 11am and 1pm, then a chance of snow after 1pm. Mostly sunny, with a high near 48. South wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

    High: 48 °F

    Chance
    Rain/Snow

  • Friday Night

    Friday Night: Snow likely, mainly after 11pm. Increasing clouds, with a low around 21. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 21 °F

    Snow Likely

  • Saturday

    Saturday: Snow likely, mainly before 11am. Mostly cloudy, with a high near 26. Wind chill values as low as zero. North northwest wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 26 °F

    Snow Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 3. North northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 3 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 27. Calm wind becoming west southwest around 6 mph in the afternoon.

    High: 27 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 17. South southwest wind around 7 mph.

    Low: 17 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 37. South southwest wind around 6 mph.

    High: 37 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A slight chance of rain showers before 5am, then a slight chance of rain and snow showers. Mostly cloudy, with a low around 34. South wind around 7 mph. Chance of precipitation is 20%.
Friday
A slight chance of snow before 11am, then a chance of rain and snow between 11am and 1pm, then a chance of snow after 1pm. Mostly sunny, with a high near 48. South wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Friday Night
Snow likely, mainly after 11pm. Increasing clouds, with a low around 21. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday
Snow likely, mainly before 11am. Mostly cloudy, with a high near 26. Wind chill values as low as zero. North northwest wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Saturday Night
Partly cloudy, with a low around 3. North northwest wind 5 to 8 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 27. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 17. South southwest wind around 7 mph.
Monday
Mostly sunny, with a high near 37. South southwest wind around 6 mph.
Monday Night
Mostly cloudy, with a low around 27.
Tuesday
Mostly cloudy, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
Mostly cloudy, with a low around 27.
New Year's Day
A slight chance of snow. Mostly cloudy, with a high near 42.
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ABOUT THIS FORECAST

 
Point Forecast:
Helena MT
 46.58°N 112.04°W (Elev. 4413 ft)
Last Update:
1:22 am MST Dec 26, 2025
Forecast Valid:
2am MST Dec 26, 2025-6pm MST Jan 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation