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

91°F

33°C

Humidity 70%
Wind Speed W 6 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 80°F (27°C)
Visibility 10.00 mi
Heat Index109°F (43°C)
Last update 26 Jul 11:54 am CDT
Extended Forecast for

3 Miles WSW Winfield MO

Extreme Heat Warning until July 27, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning until July 27, 09:00pm

    NOW until 9:00pm Mon

    Extreme Heat Warning

  • This Afternoon

    High: 97 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 77. Calm wind. Chance of precipitation is 20%.

    Low: 77 °F

    Isolated
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 96. Heat index values as high as 110. Southwest wind 3 to 8 mph.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. Southwest wind around 6 mph becoming northwest after midnight.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 92. Northwest wind around 6 mph.

    High: 92 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny and hot, with a high near 97. Heat index values as high as 118. Calm wind becoming west around 5 mph.
Tonight
Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 77. Calm wind. Chance of precipitation is 20%.
Monday
Sunny, with a high near 96. Heat index values as high as 110. Southwest wind 3 to 8 mph.
Monday Night
Mostly clear, with a low around 78. Southwest wind around 6 mph becoming northwest after midnight.
Tuesday
Mostly sunny, with a high near 92. Northwest wind around 6 mph.
Tuesday Night
Partly cloudy, with a low around 71.
Wednesday
Sunny, with a high near 89.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Sunny, with a high near 89.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 69.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Winfield MO
 38.99°N 90.79°W (Elev. 499 ft)
Last Update:
11:21 am CDT Jul 26, 2026
Forecast Valid:
12pm CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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