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

33°F

1°C

Humidity 75%
Wind Speed S 5 mph
Barometer 29.98 in (1015.6 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 9 Dec 5:54 am CST
Extended Forecast for

3 Miles E Dow IL

  • Today

    Today: Partly sunny, with a high near 48. South wind 10 to 13 mph, with gusts as high as 22 mph.

    High: 48 °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: 42 °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 27.

    Low: 27 °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 15.

    Low: 15 °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 48. South wind 10 to 13 mph, with gusts as high as 22 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 27.
Friday
Partly sunny, with a high near 39.
Friday Night
Mostly cloudy, with a low around 15.
Saturday
Mostly cloudy, with a high near 25.
Saturday Night
Mostly cloudy, with a low around 6.
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 34. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Dow IL
 39.04°N 90.27°W (Elev. 600 ft)
Last Update:
4:01 am CST Dec 9, 2025
Forecast Valid:
6am 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