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

31°F

-1°C

Humidity 45%
Wind Speed W 5 mph
Barometer 30.08 in (1018.9 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 21 Jan 5:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Partly cloudy, with a low around 23. Northwest wind 6 to 14 mph, with gusts as high as 25 mph.

    Low: 23 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 37. West wind 3 to 7 mph.

    High: 37 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 8. Light and variable wind becoming north 13 to 18 mph in the evening. Winds could gust as high as 25 mph.

    Low: 8 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 12. Wind chill values as low as -10. North wind 13 to 18 mph, with gusts as high as 25 mph.

    High: 12 °F

    Cold

  • Friday Night

    Friday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 2. Northeast wind 11 to 13 mph.

    Low: 2 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: Snow likely, mainly after noon. Cloudy and cold, with a high near 13. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 13 °F

    Snow Likely

  • Saturday Night

    Saturday Night: Snow. Low around 8. Chance of precipitation is 80%.

    Low: 8 °F

    Snow

  • Sunday

    Sunday: A 40 percent chance of snow, mainly before noon. Partly sunny and cold, with a high near 19.

    High: 19 °F

    Chance Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around -2.

    Low: -2 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 23. Northwest wind 6 to 14 mph, with gusts as high as 25 mph.
Thursday
Partly sunny, with a high near 37. West wind 3 to 7 mph.
Thursday Night
Mostly cloudy, with a low around 8. Light and variable wind becoming north 13 to 18 mph in the evening. Winds could gust as high as 25 mph.
Friday
Mostly cloudy and cold, with a high near 12. Wind chill values as low as -10. North wind 13 to 18 mph, with gusts as high as 25 mph.
Friday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 2. Northeast wind 11 to 13 mph.
Saturday
Snow likely, mainly after noon. Cloudy and cold, with a high near 13. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Saturday Night
Snow. Low around 8. Chance of precipitation is 80%.
Sunday
A 40 percent chance of snow, mainly before noon. Partly sunny and cold, with a high near 19.
Sunday Night
Partly cloudy, with a low around -2.
Monday
Sunny and cold, with a high near 16.
Monday Night
Mostly clear, with a low around 3.
Tuesday
Mostly sunny, with a high near 28.
Tuesday Night
Partly cloudy, with a low around 13.
Wednesday
Partly sunny, with a high near 25.
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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:
4:51 pm CST Jan 21, 2026
Forecast Valid:
6pm CST Jan 21, 2026-6pm CST Jan 28, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation