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.

Overcast

47°F

8°C

Humidity 69%
Wind Speed NW 12 mph
Barometer 30.09 in (1018.8 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 9 Jan 10:54 am CST
Extended Forecast for

3 Miles SW Hardin IL

  • Today

    Today: Mostly cloudy, with a high near 48. Northwest wind 5 to 8 mph becoming light and variable in the afternoon.

    High: 48 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain, mainly after 3am. Increasing clouds, with a low around 35. Calm wind becoming northwest around 6 mph after midnight.

    Low: 35 °F

    Partly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 7am. Cloudy through mid morning, then gradual clearing, with a high near 45. West wind 7 to 13 mph, with gusts as high as 25 mph.

    High: 45 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 23. Northwest wind 10 to 13 mph, with gusts as high as 24 mph.

    Low: 23 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 36. Northwest wind 5 to 13 mph, with gusts as high as 24 mph.

    High: 36 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 26.

    Low: 26 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly cloudy, with a high near 48. Northwest wind 5 to 8 mph becoming light and variable in the afternoon.
Tonight
A 50 percent chance of rain, mainly after 3am. Increasing clouds, with a low around 35. Calm wind becoming northwest around 6 mph after midnight.
Saturday
A 20 percent chance of rain before 7am. Cloudy through mid morning, then gradual clearing, with a high near 45. West wind 7 to 13 mph, with gusts as high as 25 mph.
Saturday Night
Partly cloudy, with a low around 23. Northwest wind 10 to 13 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 36. Northwest wind 5 to 13 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 26.
Monday
Sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Mostly cloudy, with a high near 54.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 40.
Wednesday Night
Mostly cloudy, with a low around 23.
Thursday
Mostly sunny, with a high near 38.
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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:
9:01 am CST Jan 9, 2026
Forecast Valid:
11am CST Jan 9, 2026-6pm CST Jan 15, 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