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

32°F

0°C

Humidity 35%
Wind Speed NW 18 G 28 mph
Barometer 30.46 in (1031.9 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 22 Feb 4:54 pm CST
Extended Forecast for

Dow IL

  • Tonight

    Tonight: Increasing clouds, with a low around 14. Northwest wind around 17 mph, with gusts as high as 30 mph.

    Low: 14 °F

    Increasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 31. Northwest wind 8 to 16 mph, with gusts as high as 25 mph.

    High: 31 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 20. Light and variable wind becoming south 6 to 11 mph after midnight.

    Low: 20 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 52. South wind 13 to 18 mph, with gusts as high as 28 mph.

    High: 52 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32. Southwest wind 6 to 11 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 34. Chance of precipitation is 60%.

    Low: 34 °F

    Rain Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Mostly sunny, with a high near 50.

    High: 50 °F

    Slight Chance
    Rain then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 14. Northwest wind around 17 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 31. Northwest wind 8 to 16 mph, with gusts as high as 25 mph.
Monday Night
Increasing clouds, with a low around 20. Light and variable wind becoming south 6 to 11 mph after midnight.
Tuesday
Mostly cloudy, with a high near 52. South wind 13 to 18 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly cloudy, with a low around 32. Southwest wind 6 to 11 mph becoming northwest after midnight. Winds could gust as high as 20 mph.
Wednesday
Mostly sunny, with a high near 52.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 34. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Mostly sunny, with a high near 50.
Thursday Night
Mostly clear, with a low around 29.
Friday
Sunny, with a high near 63.
Friday Night
Mostly clear, with a low around 37.
Saturday
Sunny, with a high near 62.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
A slight chance of rain and snow. Partly sunny, with a high near 48. 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:
3:11 pm CST Feb 22, 2026
Forecast Valid:
5pm CST Feb 22, 2026-6pm CST Mar 1, 2026
 
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