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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Mostly Cloudy

74°F

23°C

Humidity 64%
Wind Speed SE 9 mph
Barometer 30.04 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 27 Aug 8:35 pm CDT
Extended Forecast for

Reliance SD

  • Tonight

    Tonight: Partly cloudy, with a low around 63. Southeast wind 11 to 15 mph, with gusts as high as 23 mph.

    Low: 63 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and hot, with a high near 91. Breezy, with a south southeast wind 13 to 23 mph, with gusts as high as 33 mph.

    High: 91 °F

    Hot and
    Breezy

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly between 10pm and 4am. Partly cloudy, with a low around 69. Breezy, with a south southeast wind 13 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    T-storms and
    Breezy

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 92. South wind around 9 mph becoming northwest in the afternoon.

    High: 92 °F

    Hot

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69. East wind 9 to 11 mph becoming west southwest after midnight. Chance of precipitation is 20%.

    Low: 69 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 90. Northwest wind 8 to 10 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 90 °F

    Hot

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 67. South southeast wind around 10 mph becoming north in the evening.

    Low: 67 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 86. Northwest wind 10 to 13 mph becoming southeast in the afternoon. Winds could gust as high as 22 mph.

    High: 86 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. Southeast wind around 8 mph.

    Low: 64 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 63. Southeast wind 11 to 15 mph, with gusts as high as 23 mph.
Friday
Mostly sunny and hot, with a high near 91. Breezy, with a south southeast wind 13 to 23 mph, with gusts as high as 33 mph.
Friday Night
A chance of showers and thunderstorms, mainly between 10pm and 4am. Partly cloudy, with a low around 69. Breezy, with a south southeast wind 13 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Saturday
Mostly sunny and hot, with a high near 92. South wind around 9 mph becoming northwest in the afternoon.
Saturday Night
A slight chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69. East wind 9 to 11 mph becoming west southwest after midnight. Chance of precipitation is 20%.
Sunday
Mostly sunny and hot, with a high near 90. Northwest wind 8 to 10 mph becoming west southwest in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 67. South southeast wind around 10 mph becoming north in the evening.
Monday
Partly sunny, with a high near 86. Northwest wind 10 to 13 mph becoming southeast in the afternoon. Winds could gust as high as 22 mph.
Monday Night
Partly cloudy, with a low around 64. Southeast wind around 8 mph.
Tuesday
Partly sunny, with a high near 86.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 63. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 89.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Reliance SD
 43.88°N 99.6°W (Elev. 1781 ft)
Last Update:
8:06 pm CDT Aug 27, 2026
Forecast Valid:
8pm CDT Aug 27, 2026-6pm CDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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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