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

39°F

4°C

Humidity 73%
Wind Speed E 7 mph
Barometer 29.91 in (1013.1 mb)
Dewpoint 31°F (-1°C)
Visibility 9.00 mi
Wind Chill34°F (1°C)
Last update 6 Dec 1:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: A slight chance of rain before 4am, then a slight chance of rain after 5am. Mostly cloudy, with a low around 32. Southeast wind 6 to 8 mph becoming south after midnight. Chance of precipitation is 20%.

    Low: 32 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A slight chance of drizzle before 11am. Mostly cloudy, with a temperature rising to near 35 by 9am, then falling to around 28 during the remainder of the day. Southwest 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
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 16. North wind 5 to 11 mph.

    Low: 16 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 31. Light and variable wind becoming south around 6 mph in the afternoon.

    High: 31 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23. South wind 6 to 10 mph.

    Low: 23 °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 26.

    Low: 26 °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. Mostly cloudy, with a low around 32. Southeast wind 6 to 8 mph becoming south after midnight. Chance of precipitation is 20%.
Sunday
A slight chance of drizzle before 11am. Mostly cloudy, with a temperature rising to near 35 by 9am, then falling to around 28 during the remainder of the day. Southwest 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 5 to 11 mph.
Monday
Mostly sunny, with a high near 31. Light and variable wind becoming south around 6 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 23. South wind 6 to 10 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 26.
Thursday
A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 36.
Thursday Night
Mostly cloudy, with a low around 18.
Friday
Partly sunny, with a high near 25.
Friday Night
Partly cloudy, with a low around 7.
Saturday
Mostly sunny, with a high near 21.
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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:
2:11 pm CST Dec 6, 2025
Forecast Valid:
3pm CST Dec 6, 2025-6pm CST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation