National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rain Across the Southern US; Unsettled Pattern in the Pacific Northwest

A storm system will bring heavy rainfall, thunderstorms, and flooding threats to portions of the Southern Plains Friday, the Lower Mississippi Valley Saturday, and the Southeast into the Mid-Atlantic on Sunday. High elevation snow and mixed precipitation and rain in the lower elevations will impact the Pacific Northwest this weekend before a stronger system moves in early next week. Read More >

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Fair

28°F

-2°C

Humidity 71%
Wind Speed W 5 mph
Barometer 30.10 in
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 12 Feb 8:35 pm CST
Extended Forecast for

Fort Thompson SD

  • Tonight

    Tonight: Mostly clear, with a low around 26. Light and variable wind.

    Low: 26 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 56. Calm wind becoming south around 5 mph.

    High: 56 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30. Light north northeast wind.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 55. Northwest wind 3 to 7 mph.

    High: 55 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Northwest wind around 6 mph becoming calm in the evening.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 62. Light south wind increasing to 5 to 10 mph in the morning.

    High: 62 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 32. South southwest wind 6 to 8 mph becoming north northeast after midnight.

    Low: 32 °F

    Mostly Cloudy

  • Washington's Birthday

    Washington's Birthday: Sunny, with a high near 59. North northeast wind 6 to 8 mph becoming east southeast in the afternoon.

    High: 59 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 36. Southeast wind 8 to 10 mph.

    Low: 36 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 26. Light and variable wind.
Friday
Sunny, with a high near 56. Calm wind becoming south around 5 mph.
Friday Night
Partly cloudy, with a low around 30. Light north northeast wind.
Saturday
Sunny, with a high near 55. Northwest wind 3 to 7 mph.
Saturday Night
Partly cloudy, with a low around 29. Northwest wind around 6 mph becoming calm in the evening.
Sunday
Partly sunny, with a high near 62. Light south wind increasing to 5 to 10 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 32. South southwest wind 6 to 8 mph becoming north northeast after midnight.
Washington's Birthday
Sunny, with a high near 59. North northeast wind 6 to 8 mph becoming east southeast in the afternoon.
Monday Night
Partly cloudy, with a low around 36. Southeast wind 8 to 10 mph.
Tuesday
A slight chance of rain after noon. Partly sunny, with a high near 58. Chance of precipitation is 20%.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 31. Chance of precipitation is 40%.
Wednesday
A chance of snow. Mostly sunny, with a high near 46. Chance of precipitation is 30%.
Wednesday Night
A slight chance of snow. Mostly cloudy, with a low around 23. Chance of precipitation is 20%.
Thursday
A slight chance of snow. Mostly sunny, with a high near 39. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fort Thompson SD
 44.05°N 99.4°W (Elev. 1447 ft)
Last Update:
8:36 pm CST Feb 12, 2026
Forecast Valid:
9pm CST Feb 12, 2026-6pm CST Feb 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation