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

88°F

31°C

Humidity 21%
Wind Speed W 13 G 21 mph
Barometer 29.83 in (1009.8 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 Mar 2:54 pm CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Partly cloudy, with a low around 50. West wind 5 to 10 mph becoming east after midnight.

    Low: 50 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 82. Light and variable wind becoming southwest 5 to 8 mph in the morning.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 62. South wind 6 to 10 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 85. Southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 85 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 39. Breezy, with a north wind 14 to 21 mph, with gusts as high as 30 mph.

    Low: 39 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 50. West wind 5 to 10 mph becoming east after midnight.
Saturday
Sunny, with a high near 82. Light and variable wind becoming southwest 5 to 8 mph in the morning.
Saturday Night
Mostly clear, with a low around 62. South wind 6 to 10 mph.
Sunday
Increasing clouds, with a high near 85. Southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 39. Breezy, with a north wind 14 to 21 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 42.
Wednesday
Mostly cloudy, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
A 20 percent chance of rain. Sunny, with a high near 78.
Thursday Night
A 40 percent chance of rain. Partly cloudy, with a low around 39.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 53.
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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:
1:56 pm CDT Mar 20, 2026
Forecast Valid:
3pm CDT Mar 20, 2026-6pm CDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation