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

Rapid Warm-Up Forecast Across Much of the Lower 48 Today and Tuesday

Most of the U.S. starts the week calm and unseasonably warm. The Heartland will be warmest, with highs 25–30° above average. Only the Gulf Coast stays chilly. Rain today is limited to western Washington while lake effect snow continues east of Lake Ontario. Cooler air returns after Tuesday, bringing a wintry mix to the Midwest and Northeast by Wednesday. Read More >

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Fair

53°F

12°C

Humidity 35%
Wind Speed W 3 mph
Barometer 29.99 in
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 12 Jan 4:35 pm CST
Extended Forecast for

Fort Thompson SD

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 56. West southwest wind around 6 mph.

    High: 56 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 39. West northwest wind 6 to 16 mph, with gusts as high as 25 mph.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Rain likely, mainly before noon. Mostly cloudy, with a high near 50. Breezy, with a west northwest wind 15 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 50 °F

    Rain Likely
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 26. Northwest wind 14 to 18 mph, with gusts as high as 28 mph.

    Low: 26 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 34. North wind 5 to 14 mph.

    High: 34 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 22. Northeast wind 5 to 8 mph becoming south after midnight.

    Low: 22 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 45. Breezy, with a south wind 9 to 14 mph becoming northwest 19 to 29 mph in the morning. Winds could gust as high as 39 mph.

    High: 45 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: A slight chance of snow after midnight. Mostly cloudy, with a low around 22. Blustery, with a northwest wind 22 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.

    Low: 22 °F

    Blustery.
    Mostly Cloudy
    then Slight
    Chance Snow

  • Friday

    Friday: A chance of snow before noon. Mostly cloudy, with a high near 30. Windy, with a north northwest wind 31 to 36 mph decreasing to 25 to 30 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 30%.

    High: 30 °F

    Windy. Chance
    Snow then
    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 56. West southwest wind around 6 mph.
Tonight
Partly cloudy, with a low around 39. West northwest wind 6 to 16 mph, with gusts as high as 25 mph.
Tuesday
Rain likely, mainly before noon. Mostly cloudy, with a high near 50. Breezy, with a west northwest wind 15 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
Mostly cloudy, with a low around 26. Northwest wind 14 to 18 mph, with gusts as high as 28 mph.
Wednesday
Partly sunny, with a high near 34. North wind 5 to 14 mph.
Wednesday Night
Mostly cloudy, with a low around 22. Northeast wind 5 to 8 mph becoming south after midnight.
Thursday
Mostly sunny, with a high near 45. Breezy, with a south wind 9 to 14 mph becoming northwest 19 to 29 mph in the morning. Winds could gust as high as 39 mph.
Thursday Night
A slight chance of snow after midnight. Mostly cloudy, with a low around 22. Blustery, with a northwest wind 22 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 20%.
Friday
A chance of snow before noon. Mostly cloudy, with a high near 30. Windy, with a north northwest wind 31 to 36 mph decreasing to 25 to 30 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 10. Blustery.
Saturday
Mostly sunny, with a high near 23. Blustery.
Saturday Night
Partly cloudy, with a low around 6.
Sunday
Mostly sunny, with a high near 33.
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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:
4:36 pm CST Jan 12, 2026
Forecast Valid:
4pm CST Jan 12, 2026-6pm CST Jan 18, 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