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.

Light Rain Fog/Mist

71°F

22°C

Humidity 96%
Wind Speed S 3 mph
Barometer 29.98 in (1014.7 mb)
Dewpoint 70°F (21°C)
Visibility 4.00 mi
Last update 15 Oct 11:54 am CDT
Extended Forecast for

4 Miles SW Hardin IL

  • This Afternoon

    This Afternoon: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 79 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 10pm, then a chance of showers between 10pm and midnight. Mostly cloudy, with a low around 46. Northwest wind 9 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely then
    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 3pm. Partly sunny, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 32 mph.

    High: 56 °F

    Partly Sunny
    and Breezy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Cloudy during the early evening, then gradual clearing, with a low around 38. North wind 6 to 16 mph, with gusts as high as 28 mph.

    Low: 38 °F

    Gradual
    Clearing

  • Saturday

    Saturday: Sunny, with a high near 60. Light and variable wind.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Tonight
Showers likely and possibly a thunderstorm before 10pm, then a chance of showers between 10pm and midnight. Mostly cloudy, with a low around 46. Northwest wind 9 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 70%.
Friday
A 20 percent chance of showers after 3pm. Partly sunny, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 32 mph.
Friday Night
Cloudy during the early evening, then gradual clearing, with a low around 38. North wind 6 to 16 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 60. Light and variable wind.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 41.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Hardin IL
 39.1°N 90.67°W (Elev. 430 ft)
Last Update:
11:21 am CDT Oct 15, 2026
Forecast Valid:
12pm CDT Oct 15, 2026-6pm CDT Oct 21, 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