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

15°F

-9°C

Humidity 95%
Wind Speed E 6 mph
Barometer 30.07 in (1018.9 mb)
Dewpoint 14°F (-10°C)
Visibility 2.50 mi
Wind Chill6°F (-14°C)
Last update 3 Dec 1:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 18. South wind around 6 mph.

    Low: 18 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of snow after 4pm. Mostly cloudy, with a high near 37. South wind 6 to 8 mph becoming northwest in the afternoon.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A 50 percent chance of snow, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 11. North wind 8 to 13 mph.

    Low: 11 °F

    Chance Snow
    then Mostly
    Cloudy

  • Thursday

    Thursday: Sunny and cold, with a high near 20. North wind 5 to 9 mph becoming light and variable in the afternoon.

    High: 20 °F

    Cold

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 9. Calm wind becoming south around 5 mph after midnight.

    Low: 9 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 34.

    High: 34 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 18. South wind around 6 mph.
Wednesday
A 50 percent chance of snow after 4pm. Mostly cloudy, with a high near 37. South wind 6 to 8 mph becoming northwest in the afternoon.
Wednesday Night
A 50 percent chance of snow, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 11. North wind 8 to 13 mph.
Thursday
Sunny and cold, with a high near 20. North wind 5 to 9 mph becoming light and variable in the afternoon.
Thursday Night
Partly cloudy, with a low around 9. Calm wind becoming south around 5 mph after midnight.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 20.
Saturday
Partly sunny, with a high near 34.
Saturday Night
Mostly cloudy, with a low around 23.
Sunday
A slight chance of snow before noon, then a slight chance of rain and snow. Mostly cloudy, with a high near 33. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 32.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 25.
Tuesday
Partly sunny, with a high near 39.
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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:
9:56 pm CST Dec 2, 2025
Forecast Valid:
2am CST Dec 3, 2025-6pm CST Dec 9, 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