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

18°F

-8°C

Humidity 65%
Wind Speed NE 8 mph
Barometer 30.46 in (1031.8 mb)
Dewpoint 8°F (-13°C)
Visibility NA
Wind Chill8°F (-13°C)
Last update 4 Dec 9:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: Mostly sunny, with a high near 21. North wind 5 to 8 mph.

    High: 21 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 9. Northeast wind around 5 mph becoming light and variable in the evening.

    Low: 9 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 36. South wind 5 to 8 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 24. South wind around 6 mph becoming west after midnight.

    Low: 24 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 35. Light and variable wind becoming northeast around 6 mph in the afternoon.

    High: 35 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of freezing rain after midnight. Cloudy, with a low around 25. Chance of precipitation is 30%.

    Low: 25 °F

    Mostly Cloudy
    then Chance
    Freezing Rain

  • Sunday

    Sunday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 31.

    High: 31 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 21. North wind 5 to 8 mph.
Tonight
Partly cloudy, with a low around 9. Northeast wind around 5 mph becoming light and variable in the evening.
Friday
Sunny, with a high near 36. South wind 5 to 8 mph.
Friday Night
Mostly cloudy, with a low around 24. South wind around 6 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 35. Light and variable wind becoming northeast around 6 mph in the afternoon.
Saturday Night
A chance of freezing rain after midnight. Cloudy, with a low around 25. Chance of precipitation is 30%.
Sunday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 31.
Sunday Night
Mostly cloudy, with a low around 15.
Monday
Mostly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Partly sunny, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 43.
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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:
7:31 am CST Dec 4, 2025
Forecast Valid:
10am CST Dec 4, 2025-6pm CST Dec 10, 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