National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

82°F

28°C

Humidity 34%
Wind Speed W 5 mph
Barometer 29.87 in (1011.0 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 16 Apr 4:54 pm CDT
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: Mostly clear, with a low around 60. South wind 3 to 6 mph.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 83. South wind 7 to 13 mph, with gusts as high as 26 mph.

    High: 83 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then showers after 4am. Low around 46. South wind around 14 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    Low: 46 °F

    T-storms then
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 56. Northwest wind around 14 mph, with gusts as high as 28 mph.

    High: 56 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Clear, with a low around 39. West wind 6 to 11 mph, with gusts as high as 22 mph.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 60. South wind 3 to 6 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 83. South wind 7 to 13 mph, with gusts as high as 26 mph.
Friday Night
Showers and thunderstorms likely before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then showers after 4am. Low around 46. South wind around 14 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday
A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 56. Northwest wind around 14 mph, with gusts as high as 28 mph.
Saturday Night
Clear, with a low around 39. West wind 6 to 11 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 42.
Monday
Sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Sunny, with a high near 77.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 56.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77.
Basemap Options
Click map to change the forecast location
Loading map...
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:
2:41 pm CDT Apr 16, 2026
Forecast Valid:
4pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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