National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

75°F

24°C

Humidity 74%
Wind Speed W 12 mph
Barometer 29.89 in (1011.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 15 Oct 6:54 pm CDT
Extended Forecast for

Hardin IL

  • Tonight

    Tonight: Showers and thunderstorms likely before 11pm, then isolated showers between 11pm and midnight. Mostly cloudy, with a low around 46. Northwest wind 9 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    Low: 46 °F

    Showers
    Likely then
    Mostly Cloudy

  • Friday

    Friday: Isolated showers after 3pm. Increasing clouds, with a high near 54. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.

    High: 54 °F

    Breezy.
    Partly Sunny
    then Isolated
    Showers

  • Friday Night

    Friday Night: Cloudy during the early evening, then gradual clearing, with a low around 37. North wind 6 to 16 mph, with gusts as high as 30 mph.

    Low: 37 °F

    Gradual
    Clearing

  • Saturday

    Saturday: Sunny, with a high near 59. Light and variable wind.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37. Light and variable wind.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely before 11pm, then isolated showers between 11pm and midnight. Mostly cloudy, with a low around 46. Northwest wind 9 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Friday
Isolated showers after 3pm. Increasing clouds, with a high near 54. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.
Friday Night
Cloudy during the early evening, then gradual clearing, with a low around 37. North wind 6 to 16 mph, with gusts as high as 30 mph.
Saturday
Sunny, with a high near 59. Light and variable wind.
Saturday Night
Clear, with a low around 37. Light and variable wind.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 71.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 50.
Thursday
Sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hardin IL
 39.16°N 90.64°W (Elev. 692 ft)
Last Update:
5:41 pm CDT Oct 15, 2026
Forecast Valid:
7pm CDT Oct 15, 2026-6pm CDT Oct 22, 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