Severe Thunderstorms in the Ohio Valley and Mid-Atlantic; Heat Continuing in the Central U.S.

Widespread strong to severe thunderstorms are expected from the Upper Ohio Valley into the Mid-Atlantic through Friday, with damaging winds as the primary threat. Dangerous heat will continue from the South-Central U.S. to the Midwest, Ohio/Tennessee valleys, and Mid-Atlantic. Widespread Major to Extreme Heat Risk is forecast into the weekend and will confine to the South-Central U.S. by Labor Day Read More >

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

77°F

25°C

Humidity 88%
Wind Speed NE 3 mph
Barometer 29.93 in (1012.8 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 4 Sep 12:54 am CDT
Extended Forecast for

3 Miles NNE Saint Peters MO

Extreme Heat Warning September 4, 01:51am until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 4, 01:51am until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Overnight

    Low: 76 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 99. Heat index values as high as 107. Southwest wind 3 to 6 mph.

    High: 99 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Calm wind.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 99. Heat index values as high as 107. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. Light and variable wind.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Labor Day

    Labor Day: Sunny, with a high near 92.

    High: 92 °F

    Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 76. South wind around 5 mph.
Friday
Sunny and hot, with a high near 99. Heat index values as high as 107. Southwest wind 3 to 6 mph.
Friday Night
Mostly clear, with a low around 75. Calm wind.
Saturday
Mostly sunny and hot, with a high near 99. Heat index values as high as 107. Calm wind becoming northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 73. Light and variable wind.
Sunday
Sunny, with a high near 93.
Sunday Night
Partly cloudy, with a low around 69.
Labor Day
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Mostly clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 99.
Wednesday Night
A 20 percent chance of showers. Mostly clear, with a low around 76.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Saint Peters MO
 38.83°N 90.56°W (Elev. 420 ft)
1:26 am CDT Sep 4, 2026
1am CDT Sep 4, 2026-6pm CDT Sep 10, 2026
 
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Additional Resources

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