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

42°F

6°C

Humidity 51%
Wind Speed E 14 mph
Barometer 30.11 in (1020.0 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 8 Feb 2:54 pm CST
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: Partly cloudy, with a low around 28. East wind 5 to 7 mph becoming calm after midnight.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Patchy fog between 8am and 9am. Otherwise, mostly sunny, with a high near 54. Calm wind becoming south around 6 mph in the afternoon.

    High: 54 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40. South wind 6 to 9 mph becoming west after midnight.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 56. North wind around 7 mph.

    High: 56 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32. North wind around 6 mph.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of snow before noon, then a chance of rain. Mostly cloudy, with a high near 44. Chance of precipitation is 30%.

    High: 44 °F

    Slight Chance
    Snow then
    Chance Rain

  • Thursday Night

    Thursday Night: A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 28. East wind 5 to 7 mph becoming calm after midnight.
Monday
Patchy fog between 8am and 9am. Otherwise, mostly sunny, with a high near 54. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 40. South wind 6 to 9 mph becoming west after midnight.
Tuesday
Sunny, with a high near 56. North wind around 7 mph.
Tuesday Night
Mostly cloudy, with a low around 32. North wind around 6 mph.
Wednesday
Mostly sunny, with a high near 48.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
A slight chance of snow before noon, then a chance of rain. Mostly cloudy, with a high near 44. Chance of precipitation is 30%.
Thursday Night
A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 32.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 43.
Friday Night
A 30 percent chance of rain. Partly cloudy, with a low around 31.
Saturday
A 40 percent chance of rain. Partly sunny, with a high near 43.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 32.
Sunday
A slight chance of rain and snow. Sunny, with a high near 48. Chance of precipitation is 20%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Hardin IL
 39.1°N 90.64°W (Elev. 758 ft)
Last Update:
12:26 pm CST Feb 8, 2026
Forecast Valid:
3pm CST Feb 8, 2026-6pm CST Feb 15, 2026
 
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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