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

12°F

-11°C

Humidity 70%
Wind Speed E 3 mph
Barometer 30.25 in (1025.0 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Last update 4 Dec 9:54 pm CST
Extended Forecast for

Hardin ILSimilar City Names

  • Tonight

    Tonight: Clear, with a low around 6. Calm wind becoming south around 5 mph after midnight.

    Low: 6 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 37. South wind 5 to 7 mph.

    High: 37 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 25. South wind around 6 mph becoming calm after midnight.

    Low: 25 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 35. Light and variable wind.

    High: 35 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 28. East wind 3 to 6 mph.

    Low: 28 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 33. Chance of precipitation is 30%.

    High: 33 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 6. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 37. South wind 5 to 7 mph.
Friday Night
Mostly cloudy, with a low around 25. South wind around 6 mph becoming calm after midnight.
Saturday
Partly sunny, with a high near 35. Light and variable wind.
Saturday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 28. East wind 3 to 6 mph.
Sunday
A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 33. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 11.
Monday
Mostly sunny, with a high near 30.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Partly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hardin ILSimilar City Names
 39.14°N 90.61°W (Elev. 427 ft)
Last Update:
8:26 pm CST Dec 4, 2025
Forecast Valid:
10pm CST Dec 4, 2025-6pm CST Dec 11, 2025
 
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Additional Resources

Radar & Satellite Image

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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