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

49°F

9°C

Humidity 61%
Wind Speed SE 5 mph
Barometer 29.88 in (1011.9 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 8 Mar 8:54 pm CDT
Extended Forecast for

3 Miles W Brussels IL

  • Tonight

    Tonight: Clear, with a low around 45. South wind around 7 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 77. Southwest wind 7 to 16 mph, with gusts as high as 29 mph.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60. South wind 7 to 9 mph.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Increasing clouds, with a high near 82. South wind 6 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 50%.

    High: 82 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 50. South wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.

    Low: 50 °F

    T-storms then
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Temperature rising to near 64 by 8am, then falling to around 50 during the remainder of the day. Chance of precipitation is 100%.

    High: 64 °F⇓

    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 37. Breezy.

    Low: 37 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 45. South wind around 7 mph.
Monday
Sunny, with a high near 77. Southwest wind 7 to 16 mph, with gusts as high as 29 mph.
Monday Night
Mostly clear, with a low around 60. South wind 7 to 9 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Increasing clouds, with a high near 82. South wind 6 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 50%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 50. South wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Wednesday
Showers and possibly a thunderstorm. Temperature rising to near 64 by 8am, then falling to around 50 during the remainder of the day. Chance of precipitation is 100%.
Wednesday Night
Partly cloudy, with a low around 37. Breezy.
Thursday
Sunny, with a high near 55.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 64.
Friday Night
Mostly cloudy, with a low around 38.
Saturday
Partly sunny, with a high near 58.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 42.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W Brussels IL
 38.94°N 90.64°W (Elev. 499 ft)
Last Update:
6:16 pm CDT Mar 8, 2026
Forecast Valid:
9pm CDT Mar 8, 2026-6pm CDT Mar 15, 2026
 
Forecast Discussion
 
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Additional Resources

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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