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

32°F

0°C

Humidity 64%
Wind Speed E 5 mph
Barometer 29.96 in (1014.9 mb)
Dewpoint 21°F (-6°C)
Visibility 9.00 mi
Wind Chill27°F (-3°C)
Last update 5 Dec 12:54 pm CST
Extended Forecast for

Dow IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 36. South wind around 8 mph.

    High: 36 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 26. South wind 6 to 8 mph becoming west after midnight.

    Low: 26 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 36. West wind around 6 mph becoming light and variable.

    High: 36 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 29. Southeast wind 6 to 9 mph.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before 9am, then a chance of snow between 9am and noon. Mostly cloudy, with a high near 35. Southeast wind 8 to 14 mph becoming north in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 30%.

    High: 35 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    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

Detailed Forecast

This Afternoon
Sunny, with a high near 36. South wind around 8 mph.
Tonight
Mostly cloudy, with a low around 26. South wind 6 to 8 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 36. West wind around 6 mph becoming light and variable.
Saturday Night
A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 29. Southeast wind 6 to 9 mph.
Sunday
A chance of rain and snow before 9am, then a chance of snow between 9am and noon. Mostly cloudy, with a high near 35. Southeast wind 8 to 14 mph becoming north in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 10.
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. Mostly cloudy, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 19.
Thursday
Mostly cloudy, with a high near 30.
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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:
10:26 am CST Dec 5, 2025
Forecast Valid:
1pm CST Dec 5, 2025-6pm CST Dec 11, 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