National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fog/Mist

56°F

13°C

Humidity 97%
Wind Speed E 8 mph
Barometer 29.88 in (1011.8 mb)
Dewpoint 55°F (13°C)
Visibility 2.50 mi
Last update 25 Dec 7:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Patchy fog before midnight. Otherwise, mostly cloudy, with a low around 55. South wind around 9 mph.

    Low: 55 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Friday

    Friday: Partly sunny, with a high near 65. Southwest wind 7 to 11 mph becoming northwest in the afternoon.

    High: 65 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 45. Northwest wind around 6 mph becoming calm.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65. Southeast wind 6 to 11 mph.

    High: 65 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of rain after midnight. Cloudy, with a low around 57. South wind 8 to 10 mph.

    Low: 57 °F

    Cloudy then
    Chance Rain

  • Sunday

    Sunday: Showers and possibly a thunderstorm. Temperature rising to near 66 by noon, then falling to around 54 during the remainder of the day. Chance of precipitation is 80%.

    High: 66 °F⇓

    Showers

  • Sunday Night

    Sunday Night: A chance of rain and snow before midnight. Mostly cloudy, with a low around 20. Blustery. Chance of precipitation is 50%.

    Low: 20 °F

    Blustery.
    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 27. Blustery.

    High: 27 °F

    Sunny and
    Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 17.

    Low: 17 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog before midnight. Otherwise, mostly cloudy, with a low around 55. South wind around 9 mph.
Friday
Partly sunny, with a high near 65. Southwest wind 7 to 11 mph becoming northwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 45. Northwest wind around 6 mph becoming calm.
Saturday
Partly sunny, with a high near 65. Southeast wind 6 to 11 mph.
Saturday Night
A 40 percent chance of rain after midnight. Cloudy, with a low around 57. South wind 8 to 10 mph.
Sunday
Showers and possibly a thunderstorm. Temperature rising to near 66 by noon, then falling to around 54 during the remainder of the day. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow before midnight. Mostly cloudy, with a low around 20. Blustery. Chance of precipitation is 50%.
Monday
Sunny, with a high near 27. Blustery.
Monday Night
Mostly clear, with a low around 17.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Sunny, with a high near 39.
Wednesday Night
Mostly clear, with a low around 24.
New Year's Day
Sunny, with a high near 36.
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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:
7:41 pm CST Dec 25, 2025
Forecast Valid:
8pm CST Dec 25, 2025-6pm CST Jan 1, 2026
 
Forecast Discussion
 
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Additional Resources

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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