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

24°F

-4°C

Humidity 68%
Wind Speed Calm
Barometer 30.42 in (1030.7 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Last update 11 Jan 11:54 pm CST
Extended Forecast for

4 Miles WNW Brussels IL

  • Tonight

    Tonight: Clear, with a low around 26. Calm wind becoming south around 6 mph after midnight.

    Low: 26 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 50. Southwest wind 6 to 9 mph, with gusts as high as 21 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36. Southwest wind 5 to 7 mph.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 58. West wind 8 to 15 mph, with gusts as high as 26 mph.

    High: 58 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37. West wind 9 to 13 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 42. Breezy.

    High: 42 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 26. Calm wind becoming south around 6 mph after midnight.
Monday
Sunny, with a high near 50. Southwest wind 6 to 9 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 36. Southwest wind 5 to 7 mph.
Tuesday
Increasing clouds, with a high near 58. West wind 8 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37. West wind 9 to 13 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy, with a high near 42. Breezy.
Wednesday Night
Partly cloudy, with a low around 18.
Thursday
Mostly sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Mostly cloudy, with a high near 30.
Saturday Night
Partly cloudy, with a low around 14.
Sunday
Mostly sunny, with a high near 32.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Brussels IL
 38.99°N 90.64°W (Elev. 561 ft)
Last Update:
10:36 pm CST Jan 11, 2026
Forecast Valid:
11pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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