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

41°F

5°C

Humidity 55%
Wind Speed E 14 mph
Barometer 30.11 in (1019.8 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 8 Feb 3:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Partly cloudy, with a low around 28. East wind 5 to 9 mph becoming light after midnight.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Patchy fog between 8am and 9am. Otherwise, mostly sunny, with a high near 53. Light and variable wind becoming south 5 to 7 mph in the afternoon.

    High: 53 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39. South wind 7 to 9 mph becoming west after midnight.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. West wind 7 to 10 mph becoming north in the afternoon.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32. North wind around 7 mph.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after noon. Mostly cloudy, with a high near 44.

    High: 44 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 28. East wind 5 to 9 mph becoming light after midnight.
Monday
Patchy fog between 8am and 9am. Otherwise, mostly sunny, with a high near 53. Light and variable wind becoming south 5 to 7 mph in the afternoon.
Monday Night
Mostly clear, with a low around 39. South wind 7 to 9 mph becoming west after midnight.
Tuesday
Mostly sunny, with a high near 56. West wind 7 to 10 mph becoming north in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 32. North wind around 7 mph.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
A 30 percent chance of rain after noon. Mostly cloudy, with a high near 44.
Thursday Night
A 40 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 31.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain. Partly cloudy, with a low around 31.
Saturday
A 40 percent chance of rain. Partly sunny, with a high near 44.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 32.
Sunday
A slight chance of rain and snow. Sunny, with a high near 49. Chance of precipitation is 20%.
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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:
12:26 pm CST Feb 8, 2026
Forecast Valid:
3pm CST Feb 8, 2026-6pm CST Feb 15, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation