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

39°F

4°C

Humidity 79%
Wind Speed NW 10 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 33°F (1°C)
Visibility 8.00 mi
Wind Chill32°F (0°C)
Last update 7 Dec 9:54 am CST
Extended Forecast for

Hardin IL

  • Today

    Today: Cloudy, with a temperature falling to around 31 by 5pm. North wind 7 to 13 mph, with gusts as high as 23 mph.

    High: 38 °F⇓

    Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 18. North wind 5 to 9 mph becoming calm after midnight.

    Low: 18 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 32. Light and variable wind.

    High: 32 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a temperature rising to around 33 by 5am. South wind 3 to 8 mph.

    Low: 28 °F⇑

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50. Southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    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 26.

    Low: 26 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 30 percent chance of snow. Mostly cloudy, with a high near 35.

    High: 35 °F

    Chance Snow

Detailed Forecast

Today
Cloudy, with a temperature falling to around 31 by 5pm. North wind 7 to 13 mph, with gusts as high as 23 mph.
Tonight
Mostly cloudy, with a low around 18. North wind 5 to 9 mph becoming calm after midnight.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 32. Light and variable wind.
Monday Night
Partly cloudy, with a temperature rising to around 33 by 5am. South wind 3 to 8 mph.
Tuesday
Mostly sunny, with a high near 50. Southwest wind around 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 44.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.
Thursday
A 30 percent chance of snow. Mostly cloudy, with a high near 35.
Thursday Night
Mostly cloudy, with a low around 14.
Friday
Mostly sunny, with a high near 23.
Friday Night
Mostly cloudy, with a low around 4.
Saturday
Partly sunny and cold, with a high near 19.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hardin IL
 39.16°N 90.61°W (Elev. 427 ft)
Last Update:
10:01 am CST Dec 7, 2025
Forecast Valid:
10am CST Dec 7, 2025-6pm CST Dec 13, 2025
 
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