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

36°F

2°C

Humidity 70%
Wind Speed SE 5 mph
Barometer 29.90 in (1013.0 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 5 Feb 4:54 pm CST
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. South wind 5 to 8 mph becoming northwest after midnight.

    Low: 30 °F

    Decreasing
    Clouds

  • Friday

    Friday: Increasing clouds, with a high near 45. West wind 10 to 17 mph becoming northwest in the morning. Winds could gust as high as 34 mph.

    High: 45 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 23. Northwest wind 6 to 15 mph, with gusts as high as 28 mph.

    Low: 23 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 34. Northeast wind around 6 mph becoming southeast in the afternoon.

    High: 34 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 26. Southeast wind 6 to 10 mph.

    Low: 26 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Monday Night

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

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 30. South wind 5 to 8 mph becoming northwest after midnight.
Friday
Increasing clouds, with a high near 45. West wind 10 to 17 mph becoming northwest in the morning. Winds could gust as high as 34 mph.
Friday Night
Partly cloudy, with a low around 23. Northwest wind 6 to 15 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 34. Northeast wind around 6 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 26. Southeast wind 6 to 10 mph.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Mostly clear, with a low around 29.
Monday
Sunny, with a high near 56.
Monday Night
Mostly clear, with a low around 40.
Tuesday
A 20 percent chance of rain after noon. Partly sunny, with a high near 63.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 41.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 52.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 34.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 46.
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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:
4:41 pm CST Feb 5, 2026
Forecast Valid:
5pm CST Feb 5, 2026-6pm CST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation