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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ABOUT THIS FORECAST

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