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

29°F

-2°C

Humidity 85%
Wind Speed Calm
Barometer 29.90 in (1012.9 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 5 Dec 11:54 pm CST
Extended Forecast for

Dow IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 26. West wind around 6 mph.

    Low: 26 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 36. Light and variable wind becoming southeast 5 to 8 mph in the afternoon.

    High: 36 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A chance of snow between 10pm and 2am, then a chance of rain after 2am. Cloudy, with a low around 29. Southeast wind 8 to 10 mph. Chance of precipitation is 40%.

    Low: 29 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

  • Sunday

    Sunday: A chance of rain before 9am, then a chance of rain and snow between 9am and noon, then a slight chance of snow after noon. Mostly cloudy, with a temperature rising to near 35 by 9am, then falling to around 29 during the remainder of the day. South wind 7 to 13 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

    High: 35 °F⇓

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 14. North wind 7 to 11 mph.

    Low: 14 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 21.

    Low: 21 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 26. West wind around 6 mph.
Saturday
Mostly cloudy, with a high near 36. Light and variable wind becoming southeast 5 to 8 mph in the afternoon.
Saturday Night
A chance of snow between 10pm and 2am, then a chance of rain after 2am. Cloudy, with a low around 29. Southeast wind 8 to 10 mph. Chance of precipitation is 40%.
Sunday
A chance of rain before 9am, then a chance of rain and snow between 9am and noon, then a slight chance of snow after noon. Mostly cloudy, with a temperature rising to near 35 by 9am, then falling to around 29 during the remainder of the day. South wind 7 to 13 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 14. North wind 7 to 11 mph.
Monday
Mostly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Mostly sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 25.
Thursday
Mostly cloudy, with a high near 38.
Thursday Night
Mostly cloudy, with a low around 19.
Friday
Partly sunny, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dow IL
 39.04°N 90.33°W (Elev. 623 ft)
Last Update:
10:01 pm CST Dec 5, 2025
Forecast Valid:
12am CST Dec 6, 2025-6pm CST Dec 12, 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