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

30°F

-1°C

Humidity 39%
Wind Speed NW 3 mph
Barometer 30.46 in (1031.9 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 23 Feb 4:54 pm CST
Extended Forecast for

3 Miles ESE Brussels IL

  • Tonight

    Tonight: Mostly clear, with a low around 18. Calm wind becoming southeast around 6 mph after midnight.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 56. Southeast wind 7 to 17 mph becoming southwest in the afternoon. Winds could gust as high as 36 mph.

    High: 56 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33. Southwest wind 5 to 10 mph becoming light and variable after midnight.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 52. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 52 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 36. East wind around 7 mph. Chance of precipitation is 60%.

    Low: 36 °F

    Chance Rain
    then Rain
    Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 50.

    High: 50 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 18. Calm wind becoming southeast around 6 mph after midnight.
Tuesday
Partly sunny, with a high near 56. Southeast wind 7 to 17 mph becoming southwest in the afternoon. Winds could gust as high as 36 mph.
Tuesday Night
Mostly cloudy, with a low around 33. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Wednesday
Mostly sunny, with a high near 52. Calm wind becoming northeast around 6 mph in the afternoon.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 36. East wind around 7 mph. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 50.
Thursday Night
Mostly clear, with a low around 32.
Friday
Sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 40.
Saturday
Sunny, with a high near 66.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 47. Chance of precipitation is 40%.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 31.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 46.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Brussels IL
 38.94°N 90.53°W (Elev. 420 ft)
Last Update:
2:51 pm CST Feb 23, 2026
Forecast Valid:
5pm CST Feb 23, 2026-6pm CST Mar 2, 2026
 
Forecast Discussion
 
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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