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

68°F

20°C

Humidity 65%
Wind Speed E 8 mph
Barometer 29.99 in (1015.2 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 16 Oct 7:54 pm CDT
Extended Forecast for

3 Miles SW Hardin IL

  • Tonight

    Tonight: Increasing clouds, with a low around 62. Southeast wind 6 to 8 mph.

    Low: 62 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 83. South wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 83 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 65. South wind around 9 mph. Chance of precipitation is 30%.

    Low: 65 °F

    Mostly Clear
    then Chance
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 77. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    High: 77 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 49. Southwest wind 7 to 13 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Sunday

    Sunday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 45.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers. Partly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 62. Southeast wind 6 to 8 mph.
Friday
Mostly sunny, with a high near 83. South wind 7 to 10 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 65. South wind around 9 mph. Chance of precipitation is 30%.
Saturday
Showers and possibly a thunderstorm. High near 77. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 49. Southwest wind 7 to 13 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.
Sunday
Sunny, with a high near 64.
Sunday Night
Clear, with a low around 45.
Monday
Sunny, with a high near 73.
Monday Night
A 40 percent chance of showers. Partly cloudy, with a low around 49.
Tuesday
A 20 percent chance of showers before 1pm. Sunny, with a high near 63.
Tuesday Night
Mostly clear, with a low around 41.
Wednesday
Sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Mostly sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Hardin IL
 39.12°N 90.67°W (Elev. 525 ft)
Last Update:
7:26 pm CDT Oct 16, 2025
Forecast Valid:
8pm CDT Oct 16, 2025-6pm CDT Oct 23, 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