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

82°F

28°C

Humidity 94%
Wind Speed Calm
Barometer 29.87 in (1010.7 mb)
Dewpoint 80°F (27°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 26 Jul 10:54 pm CDT
Extended Forecast for

2 Miles SW Brussels IL

Extreme Heat Warning July 26, 11:38pm until July 27, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 26, 11:38pm until July 27, 09:00pm

    NOW until 9:00pm Mon

    Extreme Heat Warning

  • Tonight

    Low: 78 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 96. Heat index values as high as 110. Light and variable wind becoming south 5 to 9 mph in the morning.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 79. Southwest wind 6 to 8 mph becoming west after midnight.

    Low: 79 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 92. Heat index values as high as 101. North wind 6 to 9 mph.

    High: 92 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. Northeast wind 3 to 8 mph.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 78. Light and variable wind.
Monday
Sunny, with a high near 96. Heat index values as high as 110. Light and variable wind becoming south 5 to 9 mph in the morning.
Monday Night
Mostly clear, with a low around 79. Southwest wind 6 to 8 mph becoming west after midnight.
Tuesday
Mostly sunny, with a high near 92. Heat index values as high as 101. North wind 6 to 9 mph.
Tuesday Night
Mostly clear, with a low around 71. Northeast wind 3 to 8 mph.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
Sunny, with a high near 89.
Thursday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 71.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 84. Chance of precipitation is 50%.
Friday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Saturday Night
Mostly clear, with a low around 68.
Sunday
Sunny, with a high near 85.
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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:
9:56 pm CDT Jul 26, 2026
Forecast Valid:
11pm CDT Jul 26, 2026-6pm CDT Aug 2, 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