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

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Fair

75°F

24°C

Humidity 20%
Wind Speed N 3 mph
Barometer 29.83 in
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 29 Mar 6:35 pm CDT
Extended Forecast for

Fort Thompson SD

  • Tonight

    Tonight: Partly cloudy, with a low around 38. Calm wind becoming east around 6 mph after midnight.

    Low: 38 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 75. East wind around 8 mph becoming west northwest in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 36. Breezy, with an east wind 10 to 15 mph becoming north 20 to 25 mph after midnight. Winds could gust as high as 40 mph.

    Low: 36 °F

    Partly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 50. Breezy, with a north northwest wind 18 to 25 mph, with gusts as high as 34 mph.

    High: 50 °F

    Mostly Cloudy
    and Breezy

  • Tuesday Night

    Tuesday Night: A slight chance of snow after 1am. Mostly cloudy, with a low around 26. North wind 9 to 14 mph becoming east after midnight. Chance of precipitation is 20%.

    Low: 26 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Wednesday

    Wednesday: Snow likely, mainly after 1pm. Cloudy, with a high near 43. East wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 43 °F

    Snow Likely

  • Wednesday Night

    Wednesday Night: A chance of snow. Mostly cloudy, with a low around 28. East wind 14 to 16 mph. Chance of precipitation is 50%.

    Low: 28 °F

    Chance Snow

  • Thursday

    Thursday: A chance of snow before 1pm, then a slight chance of rain. Mostly cloudy, with a high near 49. Breezy, with a southeast wind 14 to 22 mph. Chance of precipitation is 40%.

    High: 49 °F

    Breezy.
    Chance Snow
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: A chance of rain and snow, mainly after 1am. Mostly cloudy, with a low around 31. Breezy, with a southeast wind 20 to 22 mph. Chance of precipitation is 40%.

    Low: 31 °F

    Chance
    Rain/Snow and
    Breezy

Detailed Forecast

Tonight
Partly cloudy, with a low around 38. Calm wind becoming east around 6 mph after midnight.
Monday
Mostly sunny, with a high near 75. East wind around 8 mph becoming west northwest in the afternoon.
Monday Night
Mostly cloudy, with a low around 36. Breezy, with an east wind 10 to 15 mph becoming north 20 to 25 mph after midnight. Winds could gust as high as 40 mph.
Tuesday
Mostly cloudy, with a high near 50. Breezy, with a north northwest wind 18 to 25 mph, with gusts as high as 34 mph.
Tuesday Night
A slight chance of snow after 1am. Mostly cloudy, with a low around 26. North wind 9 to 14 mph becoming east after midnight. Chance of precipitation is 20%.
Wednesday
Snow likely, mainly after 1pm. Cloudy, with a high near 43. East wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday Night
A chance of snow. Mostly cloudy, with a low around 28. East wind 14 to 16 mph. Chance of precipitation is 50%.
Thursday
A chance of snow before 1pm, then a slight chance of rain. Mostly cloudy, with a high near 49. Breezy, with a southeast wind 14 to 22 mph. Chance of precipitation is 40%.
Thursday Night
A chance of rain and snow, mainly after 1am. Mostly cloudy, with a low around 31. Breezy, with a southeast wind 20 to 22 mph. Chance of precipitation is 40%.
Friday
Rain and snow likely before 1pm, then a chance of rain. Mostly cloudy, with a high near 54. Breezy. Chance of precipitation is 60%.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 29. Blustery. Chance of precipitation is 50%.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 45. Breezy. Chance of precipitation is 40%.
Saturday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 24. Blustery. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 49.
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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:
6:36 pm CDT Mar 29, 2026
Forecast Valid:
6pm CDT Mar 29, 2026-6pm CDT Apr 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation