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

20°F

-7°C

Humidity 57%
Wind Speed N 7 mph
Barometer 30.39 in (1029.6 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 4 Dec 11:54 am CST
Extended Forecast for

Dow IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 21. North wind 5 to 7 mph.

    High: 21 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 6. Northeast wind around 5 mph becoming calm in the evening.

    Low: 6 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 35. South wind 5 to 9 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a steady temperature around 29. South wind 5 to 7 mph becoming west after midnight.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 34. Light and variable wind becoming northeast around 6 mph in the afternoon.

    High: 34 °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 30.

    High: 30 °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

This Afternoon
Mostly sunny, with a high near 21. North wind 5 to 7 mph.
Tonight
Mostly clear, with a low around 6. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 35. South wind 5 to 9 mph.
Friday Night
Mostly cloudy, with a steady temperature around 29. South wind 5 to 7 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 34. 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 30.
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 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dow IL
 39.04°N 90.33°W (Elev. 623 ft)
Last Update:
11:21 am CST Dec 4, 2025
Forecast Valid:
12pm 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