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

22°F

-6°C

Humidity 55%
Wind Speed Calm
Barometer 30.41 in (1030.4 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 23 Feb 7:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Partly cloudy, with a low around 20. Light and variable wind becoming south 5 to 8 mph after midnight.

    Low: 20 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 54. Breezy, with a southwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 36 mph.

    High: 54 °F

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33. Southwest wind 6 to 11 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 51. Northwest wind around 6 mph becoming east in the afternoon.

    High: 51 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 34. East wind 6 to 9 mph. Chance of precipitation is 60%.

    Low: 34 °F

    Chance Rain
    then Rain
    Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 48.

    High: 48 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 20. Light and variable wind becoming south 5 to 8 mph after midnight.
Tuesday
Mostly cloudy, with a high near 54. Breezy, with a southwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 36 mph.
Tuesday Night
Mostly cloudy, with a low around 33. Southwest wind 6 to 11 mph becoming northwest after midnight. Winds could gust as high as 20 mph.
Wednesday
Mostly sunny, with a high near 51. Northwest wind around 6 mph becoming east in the afternoon.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 34. East wind 6 to 9 mph. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 48.
Thursday Night
Mostly clear, with a low around 32.
Friday
Sunny, with a high near 63.
Friday Night
Mostly clear, with a low around 39.
Saturday
Sunny, with a high near 64.
Saturday Night
Mostly cloudy, with a low around 31.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 45. Chance of precipitation is 30%.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 30.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
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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:
7:56 pm CST Feb 23, 2026
Forecast Valid:
8pm CST Feb 23, 2026-6pm CST Mar 2, 2026
 
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