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.

Partly Cloudy

59°F

15°C

Humidity 87%
Wind Speed Calm
Barometer 29.94 in (1013.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 3 Apr 3:54 am CDT
Extended Forecast for

4 Miles SSW Hardin IL

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Light and variable wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 24 mph.

    High: 79 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 54. South wind 10 to 13 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    Low: 54 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly cloudy, with a temperature falling to around 53 by 11am. West wind 10 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.

    High: 57 °F⇓

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 57. Northwest wind 8 to 10 mph, with gusts as high as 21 mph.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Light and variable wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 24 mph.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 54. South wind 10 to 13 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly cloudy, with a temperature falling to around 53 by 11am. West wind 10 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 38. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 57. Northwest wind 8 to 10 mph, with gusts as high as 21 mph.
Sunday Night
Clear, with a low around 39.
Monday
Sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 33.
Tuesday
Mostly sunny, with a high near 52.
Tuesday Night
Partly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 53.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 75.
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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:
4:51 am CDT Apr 3, 2026
Forecast Valid:
5am CDT Apr 3, 2026-6pm CDT Apr 9, 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