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

43°F

6°C

Humidity 74%
Wind Speed E 6 mph
Barometer 29.61 in (1002.5 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 18 Feb 11:54 pm CST
Extended Forecast for

4 Miles WNW Carrollton IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Southeast wind 3 to 5 mph.

    Low: 45 °F

    Mostly Cloudy

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 1pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 68. Southeast wind 5 to 10 mph becoming south 11 to 16 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%.

    High: 68 °F

    Showers
    Likely and
    Patchy Fog
    then
    Scattered
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33. Breezy, with a west wind 11 to 20 mph, with gusts as high as 31 mph.

    Low: 33 °F

    Mostly Clear
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Sunny, with a high near 46. West wind 8 to 18 mph, with gusts as high as 29 mph.

    High: 46 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 27. Northwest wind around 7 mph.

    Low: 27 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of rain and snow after noon. Sunny, with a high near 42. Chance of precipitation is 20%.

    High: 42 °F

    Mostly Sunny
    then Slight
    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 36.

    High: 36 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 45. Southeast wind 3 to 5 mph.
Thursday
Showers and thunderstorms likely, mainly before 1pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 68. Southeast wind 5 to 10 mph becoming south 11 to 16 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%.
Thursday Night
Mostly clear, with a low around 33. Breezy, with a west wind 11 to 20 mph, with gusts as high as 31 mph.
Friday
Sunny, with a high near 46. West wind 8 to 18 mph, with gusts as high as 29 mph.
Friday Night
Partly cloudy, with a low around 27. Northwest wind around 7 mph.
Saturday
A slight chance of rain and snow after noon. Sunny, with a high near 42. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 22.
Sunday
Sunny, with a high near 36.
Sunday Night
Mostly clear, with a low around 18.
Monday
Sunny, with a high near 36.
Monday Night
Mostly clear, with a low around 20.
Tuesday
Mostly sunny, with a high near 49.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
A 20 percent chance of rain. Partly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Carrollton IL
 39.31°N 90.49°W (Elev. 669 ft)
Last Update:
9:36 pm CST Feb 18, 2026
Forecast Valid:
11pm CST Feb 18, 2026-6pm CST Feb 25, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation