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

58°F

14°C

Humidity 65%
Wind Speed Calm
Barometer 29.90 in (1012.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 21 Mar 12:54 am CDT
Extended Forecast for

4 Miles SW Carrollton IL

  • Overnight

    Overnight: Mostly clear, with a low around 49. East wind 3 to 5 mph.

    Low: 49 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 85. East wind 5 to 7 mph becoming southwest in the afternoon.

    High: 85 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 62. South wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 81. Southwest wind 10 to 17 mph becoming north in the afternoon. Winds could gust as high as 28 mph.

    High: 81 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 37. North wind 13 to 18 mph, with gusts as high as 30 mph.

    Low: 37 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Monday Night

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

    Low: 38 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 60.

    High: 60 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 49. East wind 3 to 5 mph.
Saturday
Sunny, with a high near 85. East wind 5 to 7 mph becoming southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 62. South wind 6 to 10 mph, with gusts as high as 20 mph.
Sunday
Increasing clouds, with a high near 81. Southwest wind 10 to 17 mph becoming north in the afternoon. Winds could gust as high as 28 mph.
Sunday Night
Partly cloudy, with a low around 37. North wind 13 to 18 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 56.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 60.
Tuesday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 41.
Wednesday
Mostly cloudy, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
A 20 percent chance of rain. Sunny, with a high near 77.
Thursday Night
A 40 percent chance of rain. Partly cloudy, with a low around 38.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Carrollton IL
 39.25°N 90.46°W (Elev. 600 ft)
Last Update:
10:26 pm CDT Mar 20, 2026
Forecast Valid:
1am CDT Mar 21, 2026-6pm CDT Mar 27, 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