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.

A Few Clouds

40°F

4°C

Humidity 77%
Wind Speed N 10 G 21 mph
Barometer 30.39 in (1028.7 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 27 Mar 8:54 am CDT
Extended Forecast for

4 Miles SSW Hardin IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 51. North wind around 14 mph, with gusts as high as 28 mph.

    High: 51 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly clear, with a low around 29. North wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 54. Light and variable wind becoming south 5 to 7 mph in the morning.

    High: 54 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 41. South wind 8 to 10 mph.

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 68. South wind around 10 mph, with gusts as high as 20 mph.

    High: 68 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly after 1pm. Partly sunny, with a high near 84.

    High: 84 °F

    Chance Rain

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 51. North wind around 14 mph, with gusts as high as 28 mph.
Tonight
Mostly clear, with a low around 29. North wind 6 to 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 54. Light and variable wind becoming south 5 to 7 mph in the morning.
Saturday Night
Partly cloudy, with a low around 41. South wind 8 to 10 mph.
Sunday
Mostly cloudy, with a high near 68. South wind around 10 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 56.
Monday
Mostly sunny, with a high near 81.
Monday Night
A 20 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 64.
Tuesday
A 30 percent chance of rain, mainly after 1pm. Partly sunny, with a high near 84.
Tuesday Night
A chance of rain, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 50%.
Wednesday
A 50 percent chance of rain and thunderstorms. Partly sunny, with a high near 73.
Wednesday Night
Rain likely and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a high near 65.
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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:
7:36 am CDT Mar 27, 2026
Forecast Valid:
9am CDT Mar 27, 2026-6pm CDT Apr 2, 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