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

69°F

21°C

Humidity 87%
Wind Speed Calm
Barometer 30.00 in (1015.4 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 19 Jun 11:54 pm CDT
Extended Forecast for

Carrollton IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 82. Light northwest wind.

    High: 82 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 63. Light and variable wind becoming east 5 to 7 mph after midnight.

    Low: 63 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 79. East wind 9 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.

    High: 79 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 61. West wind around 10 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

    Low: 61 °F

    T-storms
    Likely

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.

    High: 75 °F

    Slight Chance
    T-storms

  • Monday Night

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

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 66. Calm wind.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 82. Light northwest wind.
Saturday Night
Increasing clouds, with a low around 63. Light and variable wind becoming east 5 to 7 mph after midnight.
Sunday
Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 79. East wind 9 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 61. West wind around 10 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carrollton IL
 39.29°N 90.4°W (Elev. 568 ft)
Last Update:
11:56 pm CDT Jun 19, 2026
Forecast Valid:
12am CDT Jun 20, 2026-6pm CDT Jun 26, 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