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

64°F

18°C

Humidity 73%
Wind Speed N 8 mph
Barometer 29.84 in (1010.1 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 24 Apr 10:54 pm CDT
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: Mostly clear, with a low around 50. North wind around 6 mph.

    Low: 50 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 75. East wind around 6 mph.

    High: 75 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 49. East wind 5 to 7 mph.

    Low: 49 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 75. Southeast wind 6 to 9 mph.

    High: 75 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 60. East wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 60 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 77. Chance of precipitation is 80%.

    High: 77 °F

    Chance
    T-storms then
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers. Partly cloudy, with a low around 52. Chance of precipitation is 60%.

    Low: 52 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers. Partly cloudy, with a low around 48.

    Low: 48 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 50. North wind around 6 mph.
Saturday
Sunny, with a high near 75. East wind around 6 mph.
Saturday Night
Mostly clear, with a low around 49. East wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 75. Southeast wind 6 to 9 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 60. East wind 10 to 14 mph, with gusts as high as 24 mph.
Monday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 77. Chance of precipitation is 80%.
Monday Night
Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers. Partly cloudy, with a low around 52. Chance of precipitation is 60%.
Tuesday
Sunny, with a high near 69.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 48.
Wednesday
Mostly sunny, with a high near 68.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 48.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 67.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 46.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 64.
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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:
10:31 pm CDT Apr 24, 2026
Forecast Valid:
11pm CDT Apr 24, 2026-6pm CDT May 1, 2026
 
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