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

39°F

4°C

Humidity 57%
Wind Speed E 3 mph
Barometer 29.94 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 6 May 9:35 pm CDT
Extended Forecast for

Fort Thompson SD

  • Tonight

    Tonight: Mostly clear, with a low around 32. Light and variable wind.

    Low: 32 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 64. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 64 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 38. North northwest wind around 6 mph becoming light and variable in the evening.

    Low: 38 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 73. Light west wind becoming northwest 12 to 17 mph in the morning. Winds could gust as high as 25 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 43. Northwest wind 8 to 13 mph becoming light and variable.

    Low: 43 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 71. West southwest wind 5 to 13 mph becoming north in the afternoon. Winds could gust as high as 21 mph.

    High: 71 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 39. North wind 8 to 13 mph becoming light after midnight.

    Low: 39 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 69. Light northwest wind increasing to 5 to 9 mph in the afternoon.

    High: 69 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40. North wind 5 to 7 mph becoming southeast after midnight.

    Low: 40 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 32. Light and variable wind.
Thursday
Increasing clouds, with a high near 64. Calm wind becoming west northwest around 6 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 38. North northwest wind around 6 mph becoming light and variable in the evening.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 73. Light west wind becoming northwest 12 to 17 mph in the morning. Winds could gust as high as 25 mph.
Friday Night
Partly cloudy, with a low around 43. Northwest wind 8 to 13 mph becoming light and variable.
Saturday
Mostly cloudy, with a high near 71. West southwest wind 5 to 13 mph becoming north in the afternoon. Winds could gust as high as 21 mph.
Saturday Night
Mostly cloudy, with a low around 39. North wind 8 to 13 mph becoming light after midnight.
Sunday
Mostly sunny, with a high near 69. Light northwest wind increasing to 5 to 9 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 40. North wind 5 to 7 mph becoming southeast after midnight.
Monday
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 80.
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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:
9:36 pm CDT May 6, 2026
Forecast Valid:
9pm CDT May 6, 2026-6pm CDT May 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

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