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

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Fair

45°F

7°C

Humidity 96%
Wind Speed SE 13 mph
Barometer 29.73 in
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 25 Dec 12:55 pm CST
Extended Forecast for

Fort Thompson SD

  • Christmas Day

    Christmas Day: Partly sunny, with a high near 53. South southeast wind 8 to 10 mph.

    High: 53 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 29. Southeast wind 5 to 8 mph becoming light and variable after midnight.

    Low: 29 °F

    Decreasing
    Clouds

  • Friday

    Friday: Areas of fog between 10am and 1pm. Areas of freezing fog between 8am and 10am. Otherwise, partly sunny, with a high near 49. Calm wind becoming east southeast 5 to 7 mph in the afternoon.

    High: 49 °F

    Areas
    Freezing Fog
    and Areas Fog

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33. East southeast wind 6 to 8 mph becoming southwest after midnight.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 51. Southwest wind 6 to 9 mph becoming north in the afternoon.

    High: 51 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of snow after midnight. Mostly cloudy, with a low around 12. Blustery, with a north northwest wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 20%.

    Low: 12 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    and Blustery

  • Sunday

    Sunday: A slight chance of snow before noon. Partly sunny, with a high near 18. Blustery, with a northwest wind 22 to 28 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.

    High: 18 °F

    Blustery.
    Slight Chance
    Snow then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 3. Blustery, with a northwest wind 13 to 20 mph, with gusts as high as 31 mph.

    Low: 3 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 23. Northwest wind 7 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 23 °F

    Sunny

Detailed Forecast

Christmas Day
Partly sunny, with a high near 53. South southeast wind 8 to 10 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 29. Southeast wind 5 to 8 mph becoming light and variable after midnight.
Friday
Areas of fog between 10am and 1pm. Areas of freezing fog between 8am and 10am. Otherwise, partly sunny, with a high near 49. Calm wind becoming east southeast 5 to 7 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 33. East southeast wind 6 to 8 mph becoming southwest after midnight.
Saturday
Partly sunny, with a high near 51. Southwest wind 6 to 9 mph becoming north in the afternoon.
Saturday Night
A slight chance of snow after midnight. Mostly cloudy, with a low around 12. Blustery, with a north northwest wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 20%.
Sunday
A slight chance of snow before noon. Partly sunny, with a high near 18. Blustery, with a northwest wind 22 to 28 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 3. Blustery, with a northwest wind 13 to 20 mph, with gusts as high as 31 mph.
Monday
Sunny, with a high near 23. Northwest wind 7 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Partly sunny, with a high near 42.
Tuesday Night
Partly cloudy, with a low around 16.
Wednesday
A slight chance of snow. Partly sunny, with a high near 31. Chance of precipitation is 20%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fort Thompson SD
 44.05°N 99.4°W (Elev. 1447 ft)
Last Update:
12:51 pm CST Dec 25, 2025
Forecast Valid:
1pm CST Dec 25, 2025-6pm CST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation