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

31°F

-1°C

Humidity 82%
Wind Speed Calm
Barometer 30.09 in (1019.1 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 12 Jan 10:54 pm CST
Extended Forecast for

4 Miles S Carrollton IL

  • Tonight

    Tonight: Mostly clear, with a low around 36. South wind 6 to 9 mph, with gusts as high as 21 mph.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 57. West wind 9 to 15 mph, with gusts as high as 28 mph.

    High: 57 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly before 9pm. Cloudy, then gradually becoming partly cloudy, with a low around 33. West wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 33 °F

    Chance Rain
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a temperature rising to near 38 by 11am, then falling to around 30 during the remainder of the day. Breezy, with a northwest wind 16 to 22 mph, with gusts as high as 34 mph.

    High: 38 °F⇓

    Partly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 15. North wind 8 to 15 mph, with gusts as high as 24 mph.

    Low: 15 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 23.

    Low: 23 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 40.

    High: 40 °F

    Mostly Cloudy
    then Chance
    Snow

  • Friday Night

    Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 16.

    Low: 16 °F

    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 36. South wind 6 to 9 mph, with gusts as high as 21 mph.
Tuesday
Increasing clouds, with a high near 57. West wind 9 to 15 mph, with gusts as high as 28 mph.
Tuesday Night
A 30 percent chance of rain, mainly before 9pm. Cloudy, then gradually becoming partly cloudy, with a low around 33. West wind 10 to 14 mph, with gusts as high as 24 mph.
Wednesday
Partly sunny, with a temperature rising to near 38 by 11am, then falling to around 30 during the remainder of the day. Breezy, with a northwest wind 16 to 22 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly clear, with a low around 15. North wind 8 to 15 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 30.
Thursday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 23.
Friday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 40.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 16.
Saturday
Mostly cloudy, with a high near 26.
Saturday Night
Partly cloudy, with a low around 7.
Sunday
Mostly sunny, with a high near 24.
Sunday Night
Partly cloudy, with a low around 9.
M.L.King Day
Mostly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Carrollton IL
 39.24°N 90.4°W (Elev. 499 ft)
Last Update:
9:41 pm CST Jan 12, 2026
Forecast Valid:
11pm CST Jan 12, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation