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.

Thunderstorm in Vicinity

93°F

34°C

Humidity 58%
Wind Speed Calm
Barometer 30.04 in (1016.5 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index106°F (41°C)
Last update 16 Aug 3:54 pm CDT
Extended Forecast for

4 Miles SW Hardin IL

Heat Advisory August 16, 04:45pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 16, 04:45pm until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 96 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 75. South wind 3 to 5 mph. Chance of precipitation is 20%.

    Low: 75 °F

    Isolated
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 96. Heat index values as high as 106. Light and variable wind.

    High: 96 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Isolated showers and thunderstorms before 10pm. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 20%.

    Low: 75 °F

    Isolated
    T-storms then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96. Calm wind becoming southwest around 5 mph.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

    High: 92 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Sunny, with a high near 96. Heat index values as high as 109. South wind around 5 mph. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 75. South wind 3 to 5 mph. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 96. Heat index values as high as 106. Light and variable wind.
Sunday Night
Isolated showers and thunderstorms before 10pm. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 20%.
Monday
Sunny, with a high near 96. Calm wind becoming southwest around 5 mph.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 71.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 82.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Mostly clear, with a low around 65.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 66.
Saturday
Sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Hardin IL
 39.1°N 90.67°W (Elev. 430 ft)
Last Update:
4:16 pm CDT Aug 16, 2025
Forecast Valid:
4pm CDT Aug 16, 2025-6pm CDT Aug 23, 2025
 
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