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.

Overcast

72°F

22°C

Humidity 91%
Wind Speed E 5 mph
Barometer 30.02 in (1016.2 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 25 Jul 8:54 am 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

  • Today

    Today: Scattered showers and thunderstorms before noon, then isolated showers between noon and 1pm. Mostly sunny, with a high near 88. Calm wind becoming south around 5 mph. Chance of precipitation is 30%.

    High: 88 °F

    Scattered
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 94. Heat index values as high as 109. Light and variable wind.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 76. Light south wind.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 98. Southwest wind 5 to 9 mph, with gusts as high as 21 mph.

    High: 98 °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 93.

    High: 93 °F

    Sunny

  • Tuesday Night

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

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

Detailed Forecast

Today
Scattered showers and thunderstorms before noon, then isolated showers between noon and 1pm. Mostly sunny, with a high near 88. Calm wind becoming south around 5 mph. Chance of precipitation is 30%.
Tonight
Partly cloudy, with a low around 72. Calm wind.
Sunday
Mostly sunny, with a high near 94. Heat index values as high as 109. Light and variable wind.
Sunday Night
Partly cloudy, with a low around 76. Light south wind.
Monday
Sunny and hot, with a high near 98. Southwest wind 5 to 9 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 71.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 70.
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 90.
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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:
8:31 am CDT Jul 25, 2026
Forecast Valid:
9am CDT Jul 25, 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