National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

32°F

0°C

Humidity 75%
Wind Speed S 5 mph
Barometer 30.02 in (1016.7 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 9 Dec 3:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: Partly sunny, with a high near 49. South wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 49 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of rain between midnight and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 35. South wind 13 to 18 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 20%.

    Low: 35 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Increasing clouds, with a temperature falling to around 34 by 4pm. Breezy, with a northwest wind 20 to 25 mph decreasing to 14 to 19 mph in the afternoon. Winds could gust as high as 38 mph.

    High: 43 °F⇓

    Increasing
    Clouds and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 25. Northwest wind 5 to 10 mph.

    Low: 25 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 37. West wind 5 to 7 mph becoming east in the afternoon.

    High: 37 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 25.

    High: 25 °F

    Mostly Cloudy

Detailed Forecast

Today
Partly sunny, with a high near 49. South wind 10 to 14 mph, with gusts as high as 21 mph.
Tonight
A slight chance of rain between midnight and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 35. South wind 13 to 18 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 20%.
Wednesday
Increasing clouds, with a temperature falling to around 34 by 4pm. Breezy, with a northwest wind 20 to 25 mph decreasing to 14 to 19 mph in the afternoon. Winds could gust as high as 38 mph.
Wednesday Night
Mostly cloudy, with a low around 25. Northwest wind 5 to 10 mph.
Thursday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 37. West wind 5 to 7 mph becoming east in the afternoon.
Thursday Night
Mostly cloudy, with a low around 28.
Friday
Partly sunny, with a high near 39.
Friday Night
Mostly cloudy, with a low around 16.
Saturday
Mostly cloudy, with a high near 25.
Saturday Night
Mostly cloudy, with a low around 7.
Sunday
Mostly sunny, with a high near 21.
Sunday Night
Partly cloudy, with a low around 12.
Monday
A chance of rain and snow. Partly sunny, with a high near 35. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
4:01 am CST Dec 9, 2025
Forecast Valid:
4am CST Dec 9, 2025-6pm CST Dec 15, 2025
 
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