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

83°F

28°C

Humidity 36%
Wind Speed Vrbl 3 mph
Barometer 30.01 in (1015.6 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 19 Jun 2:54 pm CDT
Extended Forecast for

4 Miles WNW Carrollton IL

  • Tonight

    Tonight: Scattered showers, mainly after 5am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%.

    Low: 62 °F

    Mostly Cloudy
    then
    Scattered
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 83. Calm wind.

    High: 83 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 5am, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 64. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 60%.

    Low: 64 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. Some of the storms could produce heavy rainfall. High near 78. Southeast wind 8 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.

    High: 78 °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 57.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Scattered showers, mainly after 5am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 83. Calm wind.
Saturday Night
A chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 5am, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 64. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. Some of the storms could produce heavy rainfall. High near 78. Southeast wind 8 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 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 57.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 59.
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 59.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Carrollton IL
 39.31°N 90.49°W (Elev. 669 ft)
Last Update:
2:31 pm CDT Jun 19, 2026
Forecast Valid:
3pm CDT Jun 19, 2026-6pm CDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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