Heavy Rainfall and Flooding Threats in the Midwest and Ohio Valley; Heat Continues in the Plains and Southeast

An active pattern will continue to bring heavy to excessive rainfall and flash flooding threats to the Midwest and Ohio Valley over the next couple of days. Dangerous heat continues across the central/southern Plains and Southeast U.S. into next week. There is potential for record-tying/breaking temperatures with many areas forecast to see their hottest temperatures so far this year. Read More >

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Overcast

75°F

24°C

Humidity 76%
Wind Speed E 3 mph
Barometer 29.99 in
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 13 Aug 5:55 pm CDT
Extended Forecast for

Fort Thompson SD

  • Tonight

    Tonight: A slight chance of showers and thunderstorms after 4am.  Mostly cloudy, with a low around 61. Light east wind increasing to 5 to 9 mph in the evening.  Chance of precipitation is 20%.

    Low: 61 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 11am.  Mostly cloudy, with a high near 76. East southeast wind around 9 mph.  Chance of precipitation is 20%.

    High: 76 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms between 4am and 5am.  Mostly cloudy, with a low around 61. East southeast wind 3 to 7 mph.  Chance of precipitation is 20%.

    Low: 61 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm.  Mostly cloudy, with a high near 78. Light and variable wind becoming northwest 5 to 10 mph in the morning.  Chance of precipitation is 50%.

    High: 78 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am.  Partly cloudy, with a low around 58. Northwest wind 7 to 9 mph.  Chance of precipitation is 20%.

    Low: 58 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 77. North wind 6 to 8 mph.

    High: 77 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 57. East northeast wind 5 to 7 mph becoming calm  after midnight.

    Low: 57 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 81. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.  Chance of precipitation is 30%.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 60. South southeast wind 5 to 9 mph.  Chance of precipitation is 30%.

    Low: 60 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 61. Light east wind increasing to 5 to 9 mph in the evening. Chance of precipitation is 20%.
Friday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 11am. Mostly cloudy, with a high near 76. East southeast wind around 9 mph. Chance of precipitation is 20%.
Friday Night
A slight chance of showers and thunderstorms between 4am and 5am. Mostly cloudy, with a low around 61. East southeast wind 3 to 7 mph. Chance of precipitation is 20%.
Saturday
A slight chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. Light and variable wind becoming northwest 5 to 10 mph in the morning. Chance of precipitation is 50%.
Saturday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 58. Northwest wind 7 to 9 mph. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 77. North wind 6 to 8 mph.
Sunday Night
Mostly clear, with a low around 57. East northeast wind 5 to 7 mph becoming calm after midnight.
Monday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 60. South southeast wind 5 to 9 mph. Chance of precipitation is 30%.
Tuesday
A slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Chance of precipitation is 20%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Chance of precipitation is 40%.
Wednesday
A slight chance of showers. Mostly cloudy, with a high near 77. Chance of precipitation is 20%.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 57. Chance of precipitation is 30%.
Thursday
A slight chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 20%.
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ABOUT THIS FORECAST

 
Point Forecast:
Fort Thompson SD
 44.05°N 99.4°W (Elev. 1447 ft)
5:36 pm CDT Aug 13, 2026
6pm CDT Aug 13, 2026-6pm CDT Aug 20, 2026
 
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