Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Chamberlain, Chamberlain Municipal Airport (K9V9)

Lat: 43.77°NLon: 99.32°WElev: 1693ft.

Fair

75°F

24°C

Humidity 68%
Wind Speed E 5 mph
Barometer 29.98 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 19 Aug 8:15 pm CDT
Extended Forecast for

Lower Brule SD

  • Tonight

    Tonight: A slight chance of showers before 9pm.  Mostly clear, with a low around 61. Southeast wind 7 to 10 mph becoming south southwest after midnight.  Chance of precipitation is 20%.

    Low: 61 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 85. South wind 6 to 10 mph becoming north northwest in the afternoon.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. North northwest wind around 6 mph becoming light and variable  in the evening.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84. East southeast wind 5 to 10 mph.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. East northeast wind 6 to 8 mph.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80. East wind 7 to 9 mph.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 62. East wind 8 to 13 mph.  Chance of precipitation is 30%.

    Low: 62 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms before 1pm.  Mostly cloudy, with a high near 79. Breezy, with a southeast wind 14 to 20 mph, with gusts as high as 29 mph.  Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms.  Partly cloudy, with a low around 63. Southeast wind 14 to 18 mph.  Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers before 9pm. Mostly clear, with a low around 61. Southeast wind 7 to 10 mph becoming south southwest after midnight. Chance of precipitation is 20%.
Thursday
Sunny, with a high near 85. South wind 6 to 10 mph becoming north northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 62. North northwest wind around 6 mph becoming light and variable in the evening.
Friday
Sunny, with a high near 84. East southeast wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 62. East northeast wind 6 to 8 mph.
Saturday
Sunny, with a high near 80. East wind 7 to 9 mph.
Saturday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. East wind 8 to 13 mph. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 79. Breezy, with a southeast wind 14 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 63. Southeast wind 14 to 18 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 83.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 83.
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 83.
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ABOUT THIS FORECAST

 
Point Forecast:
Lower Brule SD
 44.07°N 99.58°W (Elev. 1444 ft)
7:36 pm CDT Aug 19, 2026
8pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
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Additional Resources

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