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

83°F

28°C

Humidity 67%
Wind Speed N 5 mph
Barometer 29.93 in (1013.1 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 13 Aug 6:54 pm CDT
Extended Forecast for

3 Miles WNW Brussels IL

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 67. North wind 3 to 5 mph.

    Low: 67 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 10am. Otherwise, sunny, with a high near 86. Light northeast wind.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 71. Light east wind.

    Low: 71 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 93. Heat index values as high as 100. Calm wind becoming south around 5 mph in the afternoon.

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. Southeast wind around 5 mph becoming calm after midnight.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, mostly clear, with a low around 67. North wind 3 to 5 mph.
Thursday
Patchy fog before 10am. Otherwise, sunny, with a high near 86. Light northeast wind.
Thursday Night
Mostly clear, with a low around 71. Light east wind.
Friday
Sunny, with a high near 93. Heat index values as high as 100. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 74. Southeast wind around 5 mph becoming calm after midnight.
Saturday
Sunny, with a high near 95.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 95.
Sunday Night
Partly cloudy, with a low around 75.
Monday
Mostly sunny, with a high near 94.
Monday Night
Partly cloudy, with a low around 74.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Brussels IL
 38.96°N 90.64°W (Elev. 581 ft)
Last Update:
5:36 pm CDT Aug 13, 2025
Forecast Valid:
7pm CDT Aug 13, 2025-6pm CDT Aug 20, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation