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.

Overcast

31°F

-1°C

Humidity 79%
Wind Speed N 13 mph
Barometer 30.28 in (1025.8 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 7 Dec 7:54 pm CST
Extended Forecast for

4 Miles WSW Hardin IL

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 20. North wind 5 to 11 mph, with gusts as high as 21 mph.

    Low: 20 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 33. North wind around 5 mph becoming calm.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. South wind 6 to 10 mph.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 49. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. South wind 9 to 14 mph becoming west after midnight. Winds could gust as high as 26 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 40 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 33.

    High: 33 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy during the early evening, then gradual clearing, with a low around 20. North wind 5 to 11 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 33. North wind around 5 mph becoming calm.
Monday Night
Partly cloudy, with a low around 25. South wind 6 to 10 mph.
Tuesday
Mostly sunny, with a high near 49. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 38. South wind 9 to 14 mph becoming west after midnight. Winds could gust as high as 26 mph.
Wednesday
Partly sunny, with a high near 44.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 25.
Thursday
A 40 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 17.
Friday
Partly sunny, with a high near 25.
Friday Night
Mostly cloudy, with a low around 5.
Saturday
Partly sunny and cold, with a high near 18.
Saturday Night
Mostly cloudy, with a low around 6.
Sunday
Mostly sunny, with a high near 25.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Hardin IL
 39.14°N 90.69°W (Elev. 430 ft)
Last Update:
6:51 pm CST Dec 7, 2025
Forecast Valid:
8pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
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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