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.

Partly Cloudy

63°F

17°C

Humidity 21%
Wind Speed SE 10 mph
Barometer 30.15 in (1020.8 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Last update 24 Mar 5:54 pm CDT
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. South wind around 7 mph.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. South wind 6 to 8 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of rain after 1pm. Mostly sunny, with a high near 88. Southwest wind 10 to 13 mph, with gusts as high as 24 mph.

    High: 88 °F

    Sunny then
    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 42. West wind 10 to 17 mph becoming north after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 90%.

    Low: 42 °F

    Rain

  • Friday

    Friday: A 20 percent chance of rain before 1pm. Partly sunny, with a high near 50.

    High: 50 °F

    Slight Chance
    Rain

  • Friday Night

    Friday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 44. South wind around 7 mph.
Wednesday
Mostly sunny, with a high near 77. South wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 64. South wind 8 to 10 mph, with gusts as high as 21 mph.
Thursday
A 20 percent chance of rain after 1pm. Mostly sunny, with a high near 88. Southwest wind 10 to 13 mph, with gusts as high as 24 mph.
Thursday Night
Rain. Low around 42. West wind 10 to 17 mph becoming north after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 90%.
Friday
A 20 percent chance of rain before 1pm. Partly sunny, with a high near 50.
Friday Night
Mostly clear, with a low around 31.
Saturday
Sunny, with a high near 57.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Partly sunny, with a high near 64.
Sunday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 49.
Monday
Mostly sunny, with a high near 79.
Monday Night
A 30 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 58.
Tuesday
A 40 percent chance of rain and thunderstorms. Partly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Hardin IL
 39.1°N 90.64°W (Elev. 758 ft)
Last Update:
5:46 pm CDT Mar 24, 2026
Forecast Valid:
6pm CDT Mar 24, 2026-6pm CDT Mar 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