National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

86°F

30°C

Humidity 65%
Wind Speed S 13 mph
Barometer 29.93 in (1012.9 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 21 Jun 9:54 pm CDT
Extended Forecast for

2 Miles SW Brussels IL

Heat Advisory June 21, 10:24pm until June 24, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 21, 10:24pm until June 24, 09:00pm

    NOW until 9:00pm Tue

    Heat Advisory

  • Tonight

    Low: 76 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Heat index values as high as 103. Southwest wind 7 to 14 mph, with gusts as high as 21 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 6 to 9 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97. Heat index values as high as 103. Southwest wind 6 to 9 mph.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South wind 3 to 7 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.

    High: 96 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

Detailed Forecast

Tonight
Clear, with a low around 76. South wind 6 to 9 mph.
Sunday
Sunny, with a high near 96. Heat index values as high as 103. Southwest wind 7 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 75. South wind 6 to 9 mph.
Monday
Sunny and hot, with a high near 97. Heat index values as high as 103. Southwest wind 6 to 9 mph.
Monday Night
Mostly clear, with a low around 75. South wind 3 to 7 mph.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
Sunny, with a high near 93.
Wednesday Night
Partly cloudy, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Brussels IL
 38.92°N 90.62°W (Elev. 502 ft)
Last Update:
9:22 pm CDT Jun 21, 2025
Forecast Valid:
10pm CDT Jun 21, 2025-6pm CDT Jun 28, 2025
 
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