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

28°F

-2°C

Humidity 81%
Wind Speed E 8 mph
Barometer 30.22 in (1023.8 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 8 Dec 6:54 pm CST
Extended Forecast for

Dow IL

  • Tonight

    Tonight: Clear during the early evening, then becoming mostly cloudy, with a temperature rising to around 32 by 4am. Southeast wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 27 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 49. Southwest wind 9 to 11 mph, with gusts as high as 23 mph.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 36. South wind 13 to 17 mph becoming west after midnight. Winds could gust as high as 36 mph.

    Low: 36 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Partly sunny, with a high near 44. Breezy, with a northwest wind 21 to 26 mph decreasing to 14 to 19 mph in the afternoon. Winds could gust as high as 38 mph.

    High: 44 °F

    Partly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 24. Northwest wind 6 to 10 mph.

    Low: 24 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow. Mostly cloudy, with a high near 36.

    High: 36 °F

    Slight Chance
    Snow

  • Thursday Night

    Thursday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 24.

    Low: 24 °F

    Slight Chance
    Snow

  • Friday

    Friday: Mostly cloudy, with a high near 32.

    High: 32 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear during the early evening, then becoming mostly cloudy, with a temperature rising to around 32 by 4am. Southeast wind 6 to 10 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 49. Southwest wind 9 to 11 mph, with gusts as high as 23 mph.
Tuesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 36. South wind 13 to 17 mph becoming west after midnight. Winds could gust as high as 36 mph.
Wednesday
Partly sunny, with a high near 44. Breezy, with a northwest wind 21 to 26 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 24. Northwest wind 6 to 10 mph.
Thursday
A 20 percent chance of snow. Mostly cloudy, with a high near 36.
Thursday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 24.
Friday
Mostly cloudy, with a high near 32.
Friday Night
Mostly cloudy, with a low around 11.
Saturday
Partly sunny, with a high near 21.
Saturday Night
Mostly cloudy, with a low around 12.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
Mostly cloudy, with a low around 18.
Monday
A slight chance of rain and snow. Mostly cloudy, with a high near 35. Chance of precipitation is 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:
5:06 pm CST Dec 8, 2025
Forecast Valid:
7pm CST Dec 8, 2025-6pm CST Dec 15, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation