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

71°F

22°C

Humidity 30%
Wind Speed NW 13 G 18 mph
Barometer 29.91 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 18 Mar 2:55 pm CDT
Extended Forecast for

Fort Thompson SD

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 70. West northwest wind around 14 mph, with gusts as high as 22 mph.

    High: 70 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 35. West northwest wind around 7 mph.

    Low: 35 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 73. Northwest wind 6 to 10 mph becoming southwest in the morning.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 40 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 74. West northwest wind 8 to 15 mph.

    High: 74 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41. Northwest wind 6 to 8 mph becoming south in the evening.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78. South wind 7 to 14 mph becoming north in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 34. North northeast wind 15 to 18 mph.

    Low: 34 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 48. North wind 15 to 17 mph.

    High: 48 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 70. West northwest wind around 14 mph, with gusts as high as 22 mph.
Tonight
Partly cloudy, with a low around 35. West northwest wind around 7 mph.
Thursday
Mostly sunny, with a high near 73. Northwest wind 6 to 10 mph becoming southwest in the morning.
Thursday Night
Partly cloudy, with a low around 40. West northwest wind 6 to 8 mph.
Friday
Mostly sunny, with a high near 74. West northwest wind 8 to 15 mph.
Friday Night
Mostly clear, with a low around 41. Northwest wind 6 to 8 mph becoming south in the evening.
Saturday
Mostly sunny, with a high near 78. South wind 7 to 14 mph becoming north in the afternoon.
Saturday Night
Mostly cloudy, with a low around 34. North northeast wind 15 to 18 mph.
Sunday
Partly sunny, with a high near 48. North wind 15 to 17 mph.
Sunday Night
Mostly cloudy, with a low around 26.
Monday
Mostly sunny, with a high near 57. Breezy.
Monday Night
Mostly cloudy, with a low around 34.
Tuesday
Partly sunny, with a high near 59.
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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:
2:36 pm CDT Mar 18, 2026
Forecast Valid:
3pm CDT Mar 18, 2026-6pm CDT Mar 24, 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