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

80°F

27°C

Humidity 62%
Wind Speed E 6 mph
Barometer 30.06 in (1017.4 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 30 Jul 10:54 am CDT
Extended Forecast for

Carrollton IL

  • Today

    Today: Mostly sunny, with a high near 85. East wind 3 to 6 mph.

    High: 85 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 65. East wind 5 to 7 mph.

    Low: 65 °F

    Partly Cloudy

  • Friday

    Friday: Showers and thunderstorms. High near 81. Southeast wind 8 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers then
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm after 1am. Low around 66. Southeast wind 8 to 14 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    Low: 66 °F

    T-storms

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. Northwest wind 10 to 16 mph becoming north in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 70%.

    High: 78 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Partly cloudy, with a low around 62. Chance of precipitation is 20%.

    Low: 62 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 85. East wind 3 to 6 mph.
Tonight
Partly cloudy, with a low around 65. East wind 5 to 7 mph.
Friday
Showers and thunderstorms. High near 81. Southeast wind 8 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
Friday Night
Showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm after 1am. Low around 66. Southeast wind 8 to 14 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday
Showers likely and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. Northwest wind 10 to 16 mph becoming north in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 70%.
Saturday Night
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Partly cloudy, with a low around 62. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 62.
Monday
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 63.
Tuesday
A 20 percent chance of showers. Sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 89.
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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:
9:46 am CDT Jul 30, 2026
Forecast Valid:
11am CDT Jul 30, 2026-6pm CDT Aug 5, 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