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.

Overcast

26°F

-3°C

Humidity 78%
Wind Speed W 5 mph
Barometer 30.09 in (1019.4 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 2 Dec 2:54 pm CST
Extended Forecast for

Dow IL

  • Tonight

    Tonight: Partly cloudy, with a low around 18. South wind around 7 mph.

    Low: 18 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a high near 37. South wind around 8 mph becoming northwest in the afternoon.

    High: 37 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow, mainly between 9pm and midnight. Mostly cloudy, with a low around 11. North wind 8 to 13 mph, with gusts as high as 20 mph.

    Low: 11 °F

    Chance Snow

  • Thursday

    Thursday: Mostly sunny and cold, with a high near 20. North wind 5 to 9 mph becoming calm in the afternoon.

    High: 20 °F

    Cold

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 9. Calm wind becoming south around 6 mph after midnight.

    Low: 9 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 34.

    High: 34 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 18. South wind around 7 mph.
Wednesday
Increasing clouds, with a high near 37. South wind around 8 mph becoming northwest in the afternoon.
Wednesday Night
A 30 percent chance of snow, mainly between 9pm and midnight. Mostly cloudy, with a low around 11. North wind 8 to 13 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny and cold, with a high near 20. North wind 5 to 9 mph becoming calm in the afternoon.
Thursday Night
Partly cloudy, with a low around 9. Calm wind becoming south around 6 mph after midnight.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 20.
Saturday
Partly sunny, with a high near 34.
Saturday Night
Mostly cloudy, with a low around 23.
Sunday
A slight chance of snow before noon, then a slight chance of rain and snow. Mostly cloudy, with a high near 32. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
Partly sunny, with a high near 32.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 24.
Tuesday
Partly sunny, with a high near 38.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dow IL
 39.04°N 90.33°W (Elev. 623 ft)
Last Update:
3:16 pm CST Dec 2, 2025
Forecast Valid:
3pm CST Dec 2, 2025-6pm CST Dec 9, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation