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.

Fog

57°F

14°C

Humidity 100%
Wind Speed Calm
Barometer 30.17 in
Dewpoint 57°F (14°C)
Visibility 0.25 mi
Last update 25 Sep 1:55 am CDT
Extended Forecast for

Fort Thompson SD

  • Overnight

    Overnight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 58. East southeast wind around 6 mph.

    Low: 58 °F

    Patchy Fog

  • Friday

    Friday: A slight chance of drizzle after 5pm. Patchy fog before 10am, then patchy fog after 5pm. Otherwise, cloudy, with a high near 67. East southeast wind 8 to 15 mph, with gusts as high as 24 mph.

    High: 67 °F

    Patchy Fog
    then Slight
    Chance
    Drizzle and
    Patchy Fog

  • Friday Night

    Friday Night: Drizzle likely, mainly before 10pm. Patchy fog before midnight, then patchy fog after 4am. Otherwise, cloudy, with a low around 56. Southeast wind 11 to 14 mph, with gusts as high as 24 mph.

    Low: 56 °F

    Drizzle
    Likely and
    Patchy Fog

  • Saturday

    Saturday: Mostly cloudy, with a high near 73. Southeast wind 7 to 10 mph.

    High: 73 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 57. East southeast wind 3 to 6 mph.

    Low: 57 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. Light east wind becoming east southeast 8 to 13 mph in the morning. Winds could gust as high as 21 mph.

    High: 73 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 58. Southeast wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Cloudy

  • Monday

    Monday: A chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 74. South wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 74 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 55. Southeast wind around 10 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 55 °F

    Showers

Detailed Forecast

Overnight
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 58. East southeast wind around 6 mph.
Friday
A slight chance of drizzle after 5pm. Patchy fog before 10am, then patchy fog after 5pm. Otherwise, cloudy, with a high near 67. East southeast wind 8 to 15 mph, with gusts as high as 24 mph.
Friday Night
Drizzle likely, mainly before 10pm. Patchy fog before midnight, then patchy fog after 4am. Otherwise, cloudy, with a low around 56. Southeast wind 11 to 14 mph, with gusts as high as 24 mph.
Saturday
Mostly cloudy, with a high near 73. Southeast wind 7 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 57. East southeast wind 3 to 6 mph.
Sunday
Partly sunny, with a high near 73. Light east wind becoming east southeast 8 to 13 mph in the morning. Winds could gust as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 58. Southeast wind 11 to 13 mph, with gusts as high as 21 mph.
Monday
A chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 74. South wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Monday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 55. Southeast wind around 10 mph becoming northwest after midnight. Chance of precipitation is 80%.
Tuesday
A chance of showers, mainly before 1pm. Mostly cloudy, with a high near 66. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 68.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 51. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 66.
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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:
1:21 am CDT Sep 25, 2026
Forecast Valid:
2am CDT Sep 25, 2026-6pm CDT Oct 1, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation