Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

85°F

29°C

Humidity 68%
Wind Speed S 3 mph
Barometer 29.91 in (1012.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 4 Sep 8:53 pm CDT
Extended Forecast for

Barnhart MO

Extreme Heat Warning September 4, 09:35pm until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 4, 09:35pm until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Tonight

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 100. Heat index values as high as 108. Light and variable wind.

    High: 100 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 95. Heat index values as high as 101. Northeast wind 3 to 6 mph.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66. Northeast wind around 6 mph becoming calm  after midnight.

    Low: 66 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

Detailed Forecast

Tonight
Mostly clear, with a low around 76. Calm wind.
Saturday
Sunny and hot, with a high near 100. Heat index values as high as 108. Light and variable wind.
Saturday Night
Mostly clear, with a low around 73. Calm wind.
Sunday
Sunny, with a high near 95. Heat index values as high as 101. Northeast wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 66. Northeast wind around 6 mph becoming calm after midnight.
Labor Day
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 65.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
Sunny and hot, with a high near 101.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Barnhart MO
 38.34°N 90.39°W (Elev. 587 ft)
6:36 pm CDT Sep 4, 2026
9pm CDT Sep 4, 2026-6pm CDT Sep 11, 2026
 
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Additional Resources

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