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

36°F

2°C

Humidity 82%
Wind Speed E 12 mph
Barometer 29.90 in (1012.7 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 6 Dec 6:54 pm CST
Extended Forecast for

Dow IL

  • Tonight

    Tonight: A slight chance of rain before 4am, then a slight chance of rain after 5am. Cloudy, with a low around 32. Southeast wind 6 to 9 mph. Chance of precipitation is 20%.

    Low: 32 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A slight chance of drizzle before 11am. Cloudy, with a temperature rising to near 35 by 9am, then falling to around 28 during the remainder of the day. South wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 23 mph.

    High: 35 °F⇓

    Slight Chance
    Drizzle then
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 16. North wind 6 to 13 mph, with gusts as high as 21 mph.

    Low: 16 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 30. North wind around 6 mph becoming light and variable.

    High: 30 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22. South wind 6 to 11 mph.

    Low: 22 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy
    then Slight
    Chance Snow

Detailed Forecast

Tonight
A slight chance of rain before 4am, then a slight chance of rain after 5am. Cloudy, with a low around 32. Southeast wind 6 to 9 mph. Chance of precipitation is 20%.
Sunday
A slight chance of drizzle before 11am. Cloudy, with a temperature rising to near 35 by 9am, then falling to around 28 during the remainder of the day. South wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 23 mph.
Sunday Night
Mostly cloudy, with a low around 16. North wind 6 to 13 mph, with gusts as high as 21 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 30. North wind around 6 mph becoming light and variable.
Monday Night
Partly cloudy, with a low around 22. South wind 6 to 11 mph.
Tuesday
Partly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Partly sunny, with a high near 44.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 25.
Thursday
A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 35.
Thursday Night
Mostly cloudy, with a low around 17.
Friday
Partly sunny, with a high near 24.
Friday Night
Partly cloudy, with a low around 7.
Saturday
Mostly sunny and cold, with a high near 20.
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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:
4:56 pm CST Dec 6, 2025
Forecast Valid:
7pm CST Dec 6, 2025-6pm CST Dec 13, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation