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.

Partly Cloudy

91°F

33°C

Humidity 56%
Wind Speed S 9 mph
Barometer 30.00 in (1015.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 3 Jul 2:54 pm CDT
Extended Forecast for

4 Miles W Brussels IL

Heat Advisory July 3, 10:00pm until July 4, 08:00pm
Extreme Heat Warning July 3, 03:07pm until July 3, 10:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning
  •  
    Extreme Heat Warning July 3, 03:07pm until July 3, 10:00pm

    NOW until 10:00pm Fri

    Extreme Heat Warning

  • This Afternoon

    High: 95 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 9pm, then a slight chance of thunderstorms after 5am. Partly cloudy, with a low around 75. Light south wind. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Independence Day

    Independence Day: A 40 percent chance of showers and thunderstorms, mainly after noon. Sunny, with a high near 94. Heat index values as high as 103. Light and variable wind becoming west 5 to 7 mph in the morning.

    High: 94 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly after midnight. Increasing clouds, with a low around 73. West wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming northwest around 5 mph in the morning.

    High: 90 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 50%.

    Low: 70 °F

    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 88.

    High: 88 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly before 5pm. Mostly sunny, with a high near 95. Heat index values as high as 107. Southwest wind around 7 mph.
Tonight
A slight chance of showers and thunderstorms before 9pm, then a slight chance of thunderstorms after 5am. Partly cloudy, with a low around 75. Light south wind. Chance of precipitation is 20%.
Independence Day
A 40 percent chance of showers and thunderstorms, mainly after noon. Sunny, with a high near 94. Heat index values as high as 103. Light and variable wind becoming west 5 to 7 mph in the morning.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly after midnight. Increasing clouds, with a low around 73. West wind around 5 mph becoming calm in the evening.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming northwest around 5 mph in the morning.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 50%.
Monday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Sunny, with a high near 92.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Thursday Night
A 50 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 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W Brussels IL
 38.94°N 90.64°W (Elev. 499 ft)
Last Update:
2:11 pm CDT Jul 3, 2026
Forecast Valid:
3pm CDT Jul 3, 2026-6pm CDT Jul 10, 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