National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

76°F

24°C

Humidity 88%
Wind Speed SE 3 mph
Barometer 30.01 in (1015.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 22 Jun 3:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

Extreme Heat Warning June 22, 04:42am until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 22, 04:42am until June 24, 09:00pm

    NOW until 9:00pm Tue

    Extreme Heat Warning

  • Today

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 77. South wind 6 to 10 mph.

    Low: 77 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 6 to 10 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 75. South wind 3 to 8 mph.

    Low: 75 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 20%.

    High: 94 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 7 to 14 mph.
Tonight
Clear, with a low around 77. South wind 6 to 10 mph.
Monday
Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 6 to 10 mph.
Monday Night
Partly cloudy, with a low around 75. South wind 3 to 8 mph.
Tuesday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 20%.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 74.
Wednesday
Mostly sunny, with a high near 92.
Wednesday Night
Partly cloudy, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
Last Update:
4:21 am CDT Jun 22, 2025
Forecast Valid:
4am CDT Jun 22, 2025-6pm CDT Jun 28, 2025
 
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