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

79°F

26°C

Humidity 44%
Wind Speed Vrbl 5 mph
Barometer 30.20 in (1022.2 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 23 Jun 12:54 pm CDT
Extended Forecast for

3 Miles WNW Brussels IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. Light east wind.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. Light southeast wind.

    Low: 63 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before noon, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Light and variable wind becoming south around 6 mph in the morning. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Light southwest wind.

    Low: 65 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 84. Light south wind. Chance of precipitation is 70%.

    High: 84 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: Showers and thunderstorms. Low around 66. Chance of precipitation is 80%.

    Low: 66 °F

    T-storms

  • Friday

    Friday: Showers and thunderstorms. High near 82. Chance of precipitation is 80%.

    High: 82 °F

    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 89.

    High: 89 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 81. Light east wind.
Tonight
Mostly cloudy, with a low around 63. Light southeast wind.
Wednesday
A chance of showers and thunderstorms before noon, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Light and variable wind becoming south around 6 mph in the morning. Chance of precipitation is 30%.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Light southwest wind.
Thursday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 84. Light south wind. Chance of precipitation is 70%.
Thursday Night
Showers and thunderstorms. Low around 66. Chance of precipitation is 80%.
Friday
Showers and thunderstorms. High near 82. Chance of precipitation is 80%.
Friday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 89.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Brussels IL
 38.96°N 90.64°W (Elev. 581 ft)
Last Update:
9:46 am CDT Jun 23, 2026
Forecast Valid:
1pm CDT Jun 23, 2026-6pm CDT Jun 29, 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