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

53°F

12°C

Humidity 86%
Wind Speed Calm
Barometer 30.02 in (1016.4 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 29 Sep 12:54 am CDT
Extended Forecast for

Brussels IL

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 57. Light and variable wind.

    Low: 57 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. South wind 3 to 7 mph.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 65. Southeast wind around 6 mph.

    Low: 65 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 90. South wind 6 to 10 mph.

    High: 90 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 71. South wind 8 to 10 mph.

    Low: 71 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers. Mostly cloudy, with a high near 87.

    High: 87 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 65. Chance of precipitation is 80%.

    Low: 65 °F

    Showers

  • Friday

    Friday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 73. Chance of precipitation is 70%.

    High: 73 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 57. Light and variable wind.
Tuesday
Sunny, with a high near 84. South wind 3 to 7 mph.
Tuesday Night
Mostly cloudy, with a low around 65. Southeast wind around 6 mph.
Wednesday
Partly sunny, with a high near 90. South wind 6 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 71. South wind 8 to 10 mph.
Thursday
A 50 percent chance of showers. Mostly cloudy, with a high near 87.
Thursday Night
Showers and possibly a thunderstorm. Low around 65. Chance of precipitation is 80%.
Friday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 73. Chance of precipitation is 70%.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 57.
Saturday
A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 70.
Saturday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 57.
Sunday
Mostly sunny, with a high near 71.
Sunday Night
Mostly clear, with a low around 52.
Monday
Sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brussels IL
 38.96°N 90.59°W (Elev. 499 ft)
Last Update:
1:26 am CDT Sep 29, 2026
Forecast Valid:
1am CDT Sep 29, 2026-6pm CDT Oct 5, 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