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

85°F

29°C

Humidity 59%
Wind Speed SW 7 mph
Barometer 29.81 in (1008.9 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 17 Jun 7:54 pm CDT
Extended Forecast for

5 Miles WSW Piasa IL

  • Tonight

    Tonight: A chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 72. Southwest wind 6 to 9 mph becoming southeast in the evening. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 5pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 83. Southwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 83 °F

    Chance
    T-storms then
    Heavy Rain

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms, mainly before 9pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 66. Southwest wind 6 to 11 mph becoming northwest after midnight.

    Low: 66 °F

    Heavy Rain
    then Partly
    Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 83. Northwest wind around 6 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Light and variable wind.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 72. Southwest wind 6 to 9 mph becoming southeast in the evening. Chance of precipitation is 30%.
Wednesday
Showers and thunderstorms likely, mainly after 5pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 83. Southwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly before 9pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 66. Southwest wind 6 to 11 mph becoming northwest after midnight.
Juneteenth
Sunny, with a high near 83. Northwest wind around 6 mph.
Thursday Night
Mostly clear, with a low around 66. Light and variable wind.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 93.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 75.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Piasa IL
 39.08°N 90.21°W (Elev. 600 ft)
Last Update:
6:22 pm CDT Jun 17, 2025
Forecast Valid:
8pm CDT Jun 17, 2025-6pm CDT Jun 24, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation