Severe Thunderstorms and Heavy Rain Across the Ohio Valley;

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians. Heavy rain associated with these storms may lead to considerable flash and urban flooding impacts across portions of the Ohio Valley. Mid-summer heat persists from the Central Plains to the Southeast. Read More >

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

83°F

28°C

Humidity 70%
Wind Speed SW 5 mph
Barometer 29.97 in (1014.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 11 Aug 8:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

Extreme Heat Warning August 11, 09:30am until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 11, 09:30am until August 12, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Today

    High: 97 °F

    Hot

  • Tonight

    Tonight: Partly cloudy, with a low around 75. Southwest wind 7 to 9 mph becoming northwest after midnight.

    Low: 75 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Scattered showers and thunderstorms, mainly between 9am and noon.  Sunny, with a high near 95. Heat index values as high as 106. Southwest wind 6 to 9 mph.  Chance of precipitation is 30%.

    High: 95 °F

    Scattered
    T-storms

  • Wednesday Night

    Wednesday Night: Scattered showers and thunderstorms, mainly after 5am.  Partly cloudy, with a low around 75. South wind around 7 mph becoming east after midnight.  Chance of precipitation is 30%.

    Low: 75 °F

    Scattered
    T-storms

  • Thursday

    Thursday: Scattered showers and thunderstorms, mainly before 7am.  Partly sunny, with a high near 93. East wind around 8 mph.  Chance of precipitation is 30%.

    High: 93 °F

    Scattered
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am.  Mostly cloudy, with a low around 72.

    Low: 72 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms before 1pm.  Partly sunny, with a high near 91.

    High: 91 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Today
Increasing clouds and hot, with a high near 97. Heat index values as high as 106. Southwest wind 5 to 11 mph.
Tonight
Partly cloudy, with a low around 75. Southwest wind 7 to 9 mph becoming northwest after midnight.
Wednesday
Scattered showers and thunderstorms, mainly between 9am and noon. Sunny, with a high near 95. Heat index values as high as 106. Southwest wind 6 to 9 mph. Chance of precipitation is 30%.
Wednesday Night
Scattered showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 75. South wind around 7 mph becoming east after midnight. Chance of precipitation is 30%.
Thursday
Scattered showers and thunderstorms, mainly before 7am. Partly sunny, with a high near 93. East wind around 8 mph. Chance of precipitation is 30%.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72.
Friday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 73.
Saturday
Mostly sunny and hot, with a high near 97.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 96.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
9:26 am CDT Aug 11, 2026
9am CDT Aug 11, 2026-6pm CDT Aug 17, 2026
 
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Additional Resources

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