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

49°F

9°C

Humidity 59%
Wind Speed NW 14 G 25 mph
Barometer 29.96 in (1014.7 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 6 Feb 11:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 46. Breezy, with a north wind 15 to 20 mph, with gusts as high as 32 mph.

    High: 46 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 22. North wind 6 to 14 mph, with gusts as high as 24 mph.

    Low: 22 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 35. Northeast wind around 7 mph becoming southeast in the afternoon.

    High: 35 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 26. Southeast wind 8 to 11 mph.

    Low: 26 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 51. South wind 8 to 11 mph.

    High: 51 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of rain, mainly after noon. Partly sunny, with a high near 62.

    High: 62 °F

    Chance Rain

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 46. Breezy, with a north wind 15 to 20 mph, with gusts as high as 32 mph.
Tonight
Mostly clear, with a low around 22. North wind 6 to 14 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 35. Northeast wind around 7 mph becoming southeast in the afternoon.
Saturday Night
Increasing clouds, with a low around 26. Southeast wind 8 to 11 mph.
Sunday
Mostly sunny, with a high near 51. South wind 8 to 11 mph.
Sunday Night
Mostly clear, with a low around 31.
Monday
Sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
A 40 percent chance of rain, mainly after noon. Partly sunny, with a high near 62.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 37.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 48.
Wednesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 20%.
Thursday
A slight chance of rain and snow. Mostly cloudy, with a high near 44. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
10:41 am CST Feb 6, 2026
Forecast Valid:
12pm CST Feb 6, 2026-6pm CST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

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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