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 66%
Wind Speed S 8 mph
Barometer 30.07 in (1018.8 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 5 Feb 11:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 39. South wind 7 to 10 mph.

    High: 39 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 29. South wind 6 to 10 mph becoming west in the evening.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Increasing clouds, with a high near 46. Breezy, with a west wind 13 to 22 mph becoming northwest in the morning. Winds could gust as high as 34 mph.

    High: 46 °F

    Increasing
    Clouds and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 22. Northwest wind 7 to 16 mph, with gusts as high as 28 mph.

    Low: 22 °F

    Partly Cloudy

  • 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: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 39. South wind 7 to 10 mph.
Tonight
Partly cloudy, with a low around 29. South wind 6 to 10 mph becoming west in the evening.
Friday
Increasing clouds, with a high near 46. Breezy, with a west wind 13 to 22 mph becoming northwest in the morning. Winds could gust as high as 34 mph.
Friday Night
Partly cloudy, with a low around 22. Northwest wind 7 to 16 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 35. Northeast wind around 7 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 25.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Mostly clear, with a low around 29.
Monday
Sunny, with a high near 56.
Monday Night
Mostly clear, with a low around 40.
Tuesday
A 20 percent chance of rain. Mostly sunny, with a high near 63.
Tuesday Night
A 40 percent chance of rain. Cloudy, with a low around 41.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
12:26 pm CST Feb 5, 2026
Forecast Valid:
12pm CST Feb 5, 2026-6pm CST Feb 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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