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.

Fog/Mist

34°F

1°C

Humidity 92%
Wind Speed E 5 mph
Barometer 29.93 in (1013.9 mb)
Dewpoint 32°F (0°C)
Visibility 5.00 mi
Wind Chill29°F (-2°C)
Last update 7 Dec 5:54 am CST
Extended Forecast for

Dow IL

  • Today

    Today: A chance of sprinkles and flurries before 9am. Cloudy, with a high near 37. Light and variable wind becoming north 9 to 14 mph in the morning. Winds could gust as high as 24 mph.

    High: 37 °F

    Chance
    Sprinkles/Flurries
    then Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 20. North wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 20 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 32. North wind around 6 mph becoming calm.

    High: 32 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 24. South wind 5 to 11 mph, with gusts as high as 20 mph.

    Low: 24 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48. Southwest wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °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

  • Thursday

    Thursday: A 30 percent chance of snow. Mostly cloudy, with a high near 34.

    High: 34 °F

    Chance Snow

Detailed Forecast

Today
A chance of sprinkles and flurries before 9am. Cloudy, with a high near 37. Light and variable wind becoming north 9 to 14 mph in the morning. Winds could gust as high as 24 mph.
Tonight
Mostly cloudy, with a low around 20. North wind 7 to 13 mph, with gusts as high as 22 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 32. North wind around 6 mph becoming calm.
Monday Night
Partly cloudy, with a low around 24. South wind 5 to 11 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 48. Southwest wind 11 to 13 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 39.
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. Mostly cloudy, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 15.
Friday
Partly sunny, with a high near 22.
Friday Night
Mostly cloudy, with a low around 4.
Saturday
Partly sunny and cold, with a high near 19.
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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:
5:01 am CST Dec 7, 2025
Forecast Valid:
6am CST Dec 7, 2025-6pm CST Dec 13, 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