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.

A Few Clouds

64°F

18°C

Humidity 90%
Wind Speed E 8 mph
Barometer 29.90 in (1012.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 17 Apr 7:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Increasing clouds, with a high near 84. South wind 9 to 17 mph, with gusts as high as 28 mph.

    High: 84 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms before 1am, then showers and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Low around 46. South wind 13 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    Low: 46 °F

    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 57. Northwest wind around 18 mph, with gusts as high as 28 mph.

    High: 57 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 38. West wind 6 to 14 mph, with gusts as high as 21 mph.

    Low: 38 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 65. West wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Increasing clouds, with a high near 84. South wind 9 to 17 mph, with gusts as high as 28 mph.
Tonight
Showers and thunderstorms before 1am, then showers and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Low around 46. South wind 13 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday
A 30 percent chance of showers before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 57. Northwest wind around 18 mph, with gusts as high as 28 mph.
Saturday Night
Mostly clear, with a low around 38. West wind 6 to 14 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 65. West wind 6 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 42.
Monday
Sunny, with a high near 69.
Monday Night
Mostly clear, with a low around 51.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
8:01 am CDT Apr 17, 2026
Forecast Valid:
8am CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation