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

82°F

28°C

Humidity 74%
Wind Speed SE 6 mph
Barometer 29.91 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 17 Aug 2:15 pm CDT
Extended Forecast for

Reliance SD

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms, mainly before 4pm. Mostly sunny and hot, with a high near 91. Southwest wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    High: 91 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 8pm and 10pm. Partly cloudy, with a low around 66. North northwest wind 7 to 10 mph becoming southeast in the evening. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 88. North wind 7 to 9 mph becoming east southeast in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64. East wind 7 to 11 mph. Chance of precipitation is 20%.

    Low: 64 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Sunny, with a high near 88. East wind 7 to 11 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. East wind 8 to 13 mph.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 90. Southeast wind 8 to 16 mph.

    High: 90 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 66. Southeast wind 14 to 17 mph.

    Low: 66 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 94. South wind 14 to 18 mph, with gusts as high as 28 mph.

    High: 94 °F

    Hot

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms, mainly before 4pm. Mostly sunny and hot, with a high near 91. Southwest wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Tonight
A slight chance of showers and thunderstorms between 8pm and 10pm. Partly cloudy, with a low around 66. North northwest wind 7 to 10 mph becoming southeast in the evening. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 88. North wind 7 to 9 mph becoming east southeast in the afternoon.
Monday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64. East wind 7 to 11 mph. Chance of precipitation is 20%.
Tuesday
Sunny, with a high near 88. East wind 7 to 11 mph.
Tuesday Night
Mostly clear, with a low around 64. East wind 8 to 13 mph.
Wednesday
Sunny and hot, with a high near 90. Southeast wind 8 to 16 mph.
Wednesday Night
Clear, with a low around 66. Southeast wind 14 to 17 mph.
Thursday
Sunny and hot, with a high near 94. South wind 14 to 18 mph, with gusts as high as 28 mph.
Thursday Night
A chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Friday
A slight chance of showers. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 58. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Reliance SD
 43.9°N 99.6°W (Elev. 1798 ft)
Last Update:
1:46 pm CDT Aug 17, 2025
Forecast Valid:
2pm 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