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.

Fog/Mist

76°F

24°C

Humidity 97%
Wind Speed E 3 mph
Barometer 29.91 in (1012.1 mb)
Dewpoint 75°F (24°C)
Visibility 3.00 mi
Heat Index75°F (24°C)
Last update 26 Jul 3:54 am CDT
Extended Forecast for

3 Miles WNW Winfield MO

Extreme Heat Warning July 26, 11:00am until July 27, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly between 11am and noon. Patchy fog before 8am. Otherwise, partly sunny and hot, with a high near 97. Heat index values as high as 118. Calm wind becoming west around 5 mph in the afternoon.

    High: 97 °F

    Chance
    T-storms and
    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 77. Light and variable wind.

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 97. Heat index values as high as 110. Southwest wind 3 to 8 mph.

    High: 97 °F

    Hot

  • Monday Night

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

    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

  • Thursday

    Thursday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly between 11am and noon. Patchy fog before 8am. Otherwise, partly sunny and hot, with a high near 97. Heat index values as high as 118. Calm wind becoming west around 5 mph in the afternoon.
Tonight
Partly cloudy, with a low around 77. Light and variable wind.
Monday
Sunny and hot, with a high near 97. 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.
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
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Winfield MO
 39.01°N 90.78°W (Elev. 551 ft)
Last Update:
4:31 am CDT Jul 26, 2026
Forecast Valid:
4am CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
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