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.

Fair with Haze

60°F

16°C

Humidity 84%
Wind Speed E 9 mph
Barometer 30.06 in (1017.9 mb)
Dewpoint 55°F (13°C)
Visibility 5.00 mi
Last update 24 Dec 2:54 pm CST
Extended Forecast for

3 Miles SW Dow IL

Dense Fog Advisory December 24, 09:00pm until December 25, 10:00am
Click here for hazard details and duration
Dense Fog Advisory

  • Tonight

    Tonight: Patchy dense fog after midnight. Otherwise, mostly cloudy, with a low around 49. South wind 5 to 8 mph becoming light and variable.

    Low: 49 °F

    Mostly Cloudy
    then Patchy
    Dense Fog

  • Christmas Day

    Christmas Day: Areas of dense fog before 11am. Otherwise, mostly cloudy, with a high near 65. Light and variable wind becoming east around 6 mph in the morning.

    High: 65 °F

    Areas Dense
    Fog then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 55. East wind 6 to 8 mph becoming south after midnight.

    Low: 55 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 68. Southwest wind 6 to 11 mph becoming northwest in the afternoon.

    High: 68 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 45. Northwest wind around 5 mph becoming calm in the evening.

    Low: 45 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and thunderstorms. Cloudy, with a high near 57. Chance of precipitation is 50%.

    High: 57 °F

    Chance Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 18. Blustery.

    Low: 18 °F

    Blustery.
    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Tonight
Patchy dense fog after midnight. Otherwise, mostly cloudy, with a low around 49. South wind 5 to 8 mph becoming light and variable.
Christmas Day
Areas of dense fog before 11am. Otherwise, mostly cloudy, with a high near 65. Light and variable wind becoming east around 6 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 55. East wind 6 to 8 mph becoming south after midnight.
Friday
Sunny, with a high near 68. Southwest wind 6 to 11 mph becoming northwest in the afternoon.
Friday Night
Partly cloudy, with a low around 45. Northwest wind around 5 mph becoming calm in the evening.
Saturday
Partly sunny, with a high near 65.
Saturday Night
Mostly cloudy, with a low around 52.
Sunday
A chance of rain and thunderstorms. Cloudy, with a high near 57. Chance of precipitation is 50%.
Sunday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 18. Blustery.
Monday
Sunny, with a high near 28. Blustery.
Monday Night
Mostly clear, with a low around 17.
Tuesday
Mostly sunny, with a high near 34.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Mostly sunny, with a high near 39.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Dow IL
 39.02°N 90.33°W (Elev. 650 ft)
Last Update:
3:16 pm CST Dec 24, 2025
Forecast Valid:
3pm CST Dec 24, 2025-6pm CST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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