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

64°F

18°C

Humidity 84%
Wind Speed SE 3 mph
Barometer 29.93 in (1013.0 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 16 Apr 11:54 pm CDT
Extended Forecast for

3 Miles WNW Carrollton IL

  • Overnight

    Overnight: Mostly clear, with a low around 58. South wind around 6 mph.

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Scattered showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 83. South wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.

    High: 83 °F

    Mostly Sunny
    then
    Scattered
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms before 1am, then showers and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Low around 45. South wind around 14 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    Low: 45 °F

    T-storms

  • Saturday

    Saturday: Scattered showers, mainly before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 57. Northwest wind 15 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.

    High: 57 °F

    Scattered
    Showers

  • Saturday Night

    Saturday Night: Clear, with a low around 37. West wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 58. South wind around 6 mph.
Friday
Scattered showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 83. South wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.
Friday Night
Showers and thunderstorms before 1am, then showers and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Low around 45. South wind around 14 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday
Scattered showers, mainly before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 57. Northwest wind 15 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Saturday Night
Clear, with a low around 37. West wind 7 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 39.
Monday
Sunny, with a high near 71.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 78.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 55.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Carrollton IL
 39.29°N 90.46°W (Elev. 607 ft)
Last Update:
9:01 pm CDT Apr 16, 2026
Forecast Valid:
12am CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation