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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Fair

80°F

27°C

Humidity 83%
Wind Speed Calm
Barometer 29.92 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 17 Aug 1:35 pm CDT
Extended Forecast for

3 Miles WNW Fort Thompson SD

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms, mainly before 3pm. Mostly sunny and hot, with a high near 92. West southwest wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 92 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 8pm and 11pm. Partly cloudy, with a low around 67. Northwest wind 6 to 9 mph becoming south southeast in the evening. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 89. North wind 6 to 8 mph becoming east southeast in the afternoon.

    High: 89 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65. East wind 6 to 9 mph. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Sunny, with a high near 89. East southeast wind 6 to 10 mph.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. East wind 6 to 10 mph.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 90. Southeast wind 6 to 14 mph.

    High: 90 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 66. South southeast wind 11 to 14 mph.

    Low: 66 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 95. South wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 95 °F

    Hot

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms, mainly before 3pm. Mostly sunny and hot, with a high near 92. West southwest wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Tonight
A slight chance of showers and thunderstorms between 8pm and 11pm. Partly cloudy, with a low around 67. Northwest wind 6 to 9 mph becoming south southeast in the evening. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 89. North wind 6 to 8 mph becoming east southeast in the afternoon.
Monday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65. East wind 6 to 9 mph. Chance of precipitation is 20%.
Tuesday
Sunny, with a high near 89. East southeast wind 6 to 10 mph.
Tuesday Night
Mostly clear, with a low around 64. East wind 6 to 10 mph.
Wednesday
Sunny and hot, with a high near 90. Southeast wind 6 to 14 mph.
Wednesday Night
Clear, with a low around 66. South southeast wind 11 to 14 mph.
Thursday
Sunny and hot, with a high near 95. South wind 10 to 15 mph, with gusts as high as 24 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Friday
A slight chance of showers. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 59. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Fort Thompson SD
 44.07°N 99.46°W (Elev. 1480 ft)
Last Update:
1:46 pm CDT Aug 17, 2025
Forecast Valid:
1pm CDT Aug 17, 2025-6pm CDT Aug 23, 2025
 
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