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.

Fair

78°F

26°C

Humidity 59%
Wind Speed SE 7 mph
Barometer 30.05 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 27 Aug 7:15 pm CDT
Extended Forecast for

Stephan SD

  • Tonight

    Tonight: Partly cloudy, with a low around 62. East southeast wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 62 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 88. Breezy, with a south southeast wind 13 to 21 mph, with gusts as high as 30 mph.

    High: 88 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly between 3am and 4am. Mostly cloudy, with a low around 67. South southeast wind 10 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 90. South southeast wind 6 to 8 mph becoming north northwest in the morning.

    High: 90 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 67. Northeast wind 8 to 10 mph.

    Low: 67 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 88. North wind around 10 mph becoming south in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. East wind 8 to 10 mph becoming northwest after midnight.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 85. North northwest wind around 11 mph becoming south in the afternoon. Winds could gust as high as 20 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. East southeast wind around 8 mph.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 62. East southeast wind 10 to 14 mph, with gusts as high as 23 mph.
Friday
Partly sunny, with a high near 88. Breezy, with a south southeast wind 13 to 21 mph, with gusts as high as 30 mph.
Friday Night
A chance of showers and thunderstorms, mainly between 3am and 4am. Mostly cloudy, with a low around 67. South southeast wind 10 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.
Saturday
Mostly sunny and hot, with a high near 90. South southeast wind 6 to 8 mph becoming north northwest in the morning.
Saturday Night
Mostly cloudy, with a low around 67. Northeast wind 8 to 10 mph.
Sunday
Mostly sunny, with a high near 88. North wind around 10 mph becoming south in the afternoon.
Sunday Night
Partly cloudy, with a low around 65. East wind 8 to 10 mph becoming northwest after midnight.
Monday
Mostly sunny, with a high near 85. North northwest wind around 11 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Partly cloudy, with a low around 63. East southeast wind around 8 mph.
Tuesday
Partly sunny, with a high near 85.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Stephan SD
 44.25°N 99.47°W (Elev. 1867 ft)
Last Update:
7:06 pm CDT Aug 27, 2026
Forecast Valid:
7pm 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