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

Severe Weather and Heavy Rainfall from the Midwest to the Ohio Valley; Mid-Summer Heat Continues

Severe thunderstorm and heavy rainfall threats will persist from the Midwest to Lower Great Lakes through Monday, shifting into the Ohio Valley and Central Appalachians Monday evening into Tuesday. Mid-summer heat will continue across much of the CONUS this week, with record highs possible well into the 100s across the south-central High Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Fair

74°F

23°C

Humidity 76%
Wind Speed NE 9 mph
Barometer 29.92 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 9 Aug 9:15 pm CDT
Extended Forecast for

Fort Thompson SD

  • Tonight

    Tonight: A chance of showers and thunderstorms, mainly between 4am and 5am. Mostly cloudy, with a low around 64. East northeast wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 64 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday

    Monday: A slight chance of showers and thunderstorms before 7am. Partly sunny, with a high near 88. Southeast wind 9 to 14 mph. Chance of precipitation is 10%.

    High: 88 °F

    Slight Chance
    T-storms then
    Partly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms between 9pm and midnight. Mostly cloudy, with a low around 64. East southeast wind 7 to 13 mph becoming west northwest after midnight. Chance of precipitation is 20%.

    Low: 64 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers before 1pm. Partly sunny, with a high near 86. East northeast wind 7 to 9 mph. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 63. East northeast wind 6 to 10 mph. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of thunderstorms before 7am. Partly sunny, with a high near 82. East wind 5 to 10 mph. Chance of precipitation is 10%.

    High: 82 °F

    Slight Chance
    T-storms then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 59. East northeast wind 7 to 9 mph. Chance of precipitation is 70%.

    Low: 59 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers and thunderstorms. Cloudy, with a high near 73. East wind 9 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    High: 73 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 57. East wind 8 to 11 mph. Chance of precipitation is 40%.

    Low: 57 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms, mainly between 4am and 5am. Mostly cloudy, with a low around 64. East northeast wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Monday
A slight chance of showers and thunderstorms before 7am. Partly sunny, with a high near 88. Southeast wind 9 to 14 mph. Chance of precipitation is 10%.
Monday Night
A slight chance of showers and thunderstorms between 9pm and midnight. Mostly cloudy, with a low around 64. East southeast wind 7 to 13 mph becoming west northwest after midnight. Chance of precipitation is 20%.
Tuesday
A slight chance of showers before 1pm. Partly sunny, with a high near 86. East northeast wind 7 to 9 mph. Chance of precipitation is 20%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 63. East northeast wind 6 to 10 mph. Chance of precipitation is 30%.
Wednesday
A slight chance of thunderstorms before 7am. Partly sunny, with a high near 82. East wind 5 to 10 mph. Chance of precipitation is 10%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 59. East northeast wind 7 to 9 mph. Chance of precipitation is 70%.
Thursday
A chance of showers and thunderstorms. Cloudy, with a high near 73. East wind 9 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 57. East wind 8 to 11 mph. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 71. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 40%.
Saturday
A chance of showers. Mostly cloudy, with a high near 75. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
Sunday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 76. Chance of precipitation is 20%.
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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:
8:37 pm CDT Aug 9, 2026
Forecast Valid:
9pm CDT Aug 9, 2026-6pm CDT Aug 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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