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.

Mostly Cloudy

78°F

26°C

Humidity 82%
Wind Speed SW 16 mph
Barometer 29.89 in (1011.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 15 Oct 2:54 pm CDT
Extended Forecast for

Brussels IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Partly sunny, with a high near 80. Southwest wind 11 to 13 mph, with gusts as high as 20 mph.

    High: 80 °F

    Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely before midnight, then a slight chance of showers between midnight and 2am. Increasing clouds, with a low around 44. Breezy, with a northwest wind 10 to 20 mph. Chance of precipitation is 70%.

    Low: 44 °F

    Showers
    Likely and
    Breezy then
    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers after 3pm. Increasing clouds, with a high near 57. Breezy, with a northwest wind 18 to 22 mph, with gusts as high as 32 mph.

    High: 57 °F

    Breezy.
    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Cloudy during the early evening, then gradual clearing, with a low around 37. North wind 8 to 17 mph, with gusts as high as 26 mph.

    Low: 37 °F

    Gradual
    Clearing

  • Saturday

    Saturday: Sunny, with a high near 60. North wind around 5 mph becoming calm in the morning.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

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

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Partly sunny, with a high near 80. Southwest wind 11 to 13 mph, with gusts as high as 20 mph.
Tonight
Showers and thunderstorms likely before midnight, then a slight chance of showers between midnight and 2am. Increasing clouds, with a low around 44. Breezy, with a northwest wind 10 to 20 mph. Chance of precipitation is 70%.
Friday
A 20 percent chance of showers after 3pm. Increasing clouds, with a high near 57. Breezy, with a northwest wind 18 to 22 mph, with gusts as high as 32 mph.
Friday Night
Cloudy during the early evening, then gradual clearing, with a low around 37. North wind 8 to 17 mph, with gusts as high as 26 mph.
Saturday
Sunny, with a high near 60. North wind around 5 mph becoming calm in the morning.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brussels IL
 38.94°N 90.59°W (Elev. 505 ft)
Last Update:
2:26 pm CDT Oct 15, 2026
Forecast Valid:
3pm CDT Oct 15, 2026-6pm CDT Oct 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation