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.

Light Rain

71°F

22°C

Humidity 84%
Wind Speed SE 5 mph
Barometer 30.06 in (1017.5 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 24 Jul 8:54 pm CDT
Extended Forecast for

3 Miles SW Hardin IL

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

  • Tonight

    Tonight: A chance of showers, with thunderstorms also possible after 1am. Cloudy, with a low around 69. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 87. South wind around 5 mph becoming calm in the afternoon.

    High: 87 °F

    Chance
    T-storms then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 107. Light and variable wind.

    High: 93 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. Calm wind becoming south around 5 mph after midnight.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Tuesday Night

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

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Tonight
A chance of showers, with thunderstorms also possible after 1am. Cloudy, with a low around 69. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 40%.
Saturday
A 40 percent chance of showers and thunderstorms, mainly before 11am. Cloudy, then gradually becoming mostly sunny, with a high near 87. South wind around 5 mph becoming calm in the afternoon.
Saturday Night
Partly cloudy, with a low around 71. Calm wind.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 107. Light and variable wind.
Sunday Night
Mostly clear, with a low around 75. Calm wind becoming south around 5 mph after midnight.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Partly cloudy, with a low around 73.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Partly cloudy, with a low around 71.
Thursday
Mostly sunny, with a high near 91.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Hardin IL
 39.12°N 90.67°W (Elev. 525 ft)
Last Update:
9:26 pm CDT Jul 24, 2026
Forecast Valid:
9pm CDT Jul 24, 2026-6pm CDT Jul 31, 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