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 30%
Wind Speed S 12 mph
Barometer 30.16 in (1021.6 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 20 Jan 9:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: A chance of flurries between 4am and 5am. Mostly cloudy, with a low around 29. South wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 29 °F

    Chance
    Flurries

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 40. West wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 40 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 22. Southwest wind 7 to 11 mph becoming northwest after midnight. Winds could gust as high as 25 mph.

    Low: 22 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 35. Northwest wind around 6 mph.

    High: 35 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 8. North wind 5 to 10 mph increasing to 11 to 16 mph after midnight.

    Low: 8 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 12.

    High: 12 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 2.

    Low: 2 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A 40 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 13.

    High: 13 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 7.

    Low: 7 °F

    Chance Snow

Detailed Forecast

Tonight
A chance of flurries between 4am and 5am. Mostly cloudy, with a low around 29. South wind 10 to 13 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 40. West wind 10 to 14 mph, with gusts as high as 22 mph.
Wednesday Night
Mostly clear, with a low around 22. Southwest wind 7 to 11 mph becoming northwest after midnight. Winds could gust as high as 25 mph.
Thursday
Partly sunny, with a high near 35. Northwest wind around 6 mph.
Thursday Night
Mostly cloudy, with a low around 8. North wind 5 to 10 mph increasing to 11 to 16 mph after midnight.
Friday
Mostly cloudy and cold, with a high near 12.
Friday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 2.
Saturday
A 40 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 13.
Saturday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 7.
Sunday
Partly sunny, with a high near 21.
Sunday Night
Partly cloudy, with a low around 5.
Monday
Mostly sunny, with a high near 24.
Monday Night
Mostly clear, with a low around 10.
Tuesday
Mostly sunny, with a high near 36.
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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:
7:01 pm CST Jan 20, 2026
Forecast Valid:
10pm CST Jan 20, 2026-6pm CST Jan 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation