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

82°F

28°C

Humidity 17%
Wind Speed NW 7 mph
Barometer 29.93 in
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Mar 4:15 pm CDT
Extended Forecast for

Fort Thompson SD

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 79. West wind around 11 mph, with gusts as high as 22 mph.

    High: 79 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 40. West northwest wind 6 to 8 mph.

    Low: 40 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 78. West northwest wind 6 to 11 mph.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. West northwest wind around 6 mph becoming south in the evening.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 84. South wind 5 to 10 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. East wind 10 to 18 mph becoming north after midnight. Winds could gust as high as 26 mph.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 55. North northwest wind 15 to 17 mph.

    High: 55 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 30. North wind 6 to 10 mph becoming east southeast after midnight.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Partly sunny, with a high near 62. South southeast wind 9 to 18 mph, with gusts as high as 26 mph.

    High: 62 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 79. West wind around 11 mph, with gusts as high as 22 mph.
Tonight
Partly cloudy, with a low around 40. West northwest wind 6 to 8 mph.
Friday
Sunny, with a high near 78. West northwest wind 6 to 11 mph.
Friday Night
Mostly clear, with a low around 43. West northwest wind around 6 mph becoming south in the evening.
Saturday
Sunny, with a high near 84. South wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 38. East wind 10 to 18 mph becoming north after midnight. Winds could gust as high as 26 mph.
Sunday
Mostly sunny, with a high near 55. North northwest wind 15 to 17 mph.
Sunday Night
Mostly clear, with a low around 30. North wind 6 to 10 mph becoming east southeast after midnight.
Monday
Partly sunny, with a high near 62. South southeast wind 9 to 18 mph, with gusts as high as 26 mph.
Monday Night
Mostly cloudy, with a low around 36.
Tuesday
Partly sunny, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 73.
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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:
3:36 pm CDT Mar 19, 2026
Forecast Valid:
4pm CDT Mar 19, 2026-6pm CDT Mar 25, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation