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

51°F

11°C

Humidity 96%
Wind Speed NE 6 mph
Barometer 30.08 in (1018.5 mb)
Dewpoint 50°F (10°C)
Visibility 1.25 mi
Wind Chill49°F (9°C)
Last update 25 Dec 7:54 am CST
Extended Forecast for

St. Charles County Smartt Airport MO

Dense Fog Advisory December 25, 08:39am until December 25, 12:00pm
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory December 25, 08:39am until December 25, 12:00pm

    NOW until 12:00pm Thu

    Dense Fog Advisory

  • Christmas Day

    High: 64 °F

    Dense Fog

  • Tonight

    Tonight: Mostly cloudy, with a low around 53. East wind around 7 mph becoming southwest after midnight.

    Low: 53 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 69. Southwest wind 7 to 11 mph becoming northwest in the afternoon.

    High: 69 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 42. Northwest wind around 5 mph becoming calm in the evening.

    Low: 42 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 66. Southeast wind 5 to 10 mph.

    High: 66 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday

    Sunday: Rain likely, with thunderstorms also possible after noon. Cloudy, with a high near 63. Chance of precipitation is 70%.

    High: 63 °F

    Rain Likely

  • Sunday Night

    Sunday Night: A chance of rain and snow before midnight. Mostly cloudy, with a low around 18. Blustery. Chance of precipitation is 30%.

    Low: 18 °F

    Chance
    Rain/Snow
    then Partly
    Cloudy and
    Blustery

Detailed Forecast

Christmas Day
Widespread dense fog, mainly before 10am. Otherwise, cloudy, with a high near 64. Light and variable wind becoming east around 6 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 53. East wind around 7 mph becoming southwest after midnight.
Friday
Mostly sunny, with a high near 69. Southwest wind 7 to 11 mph becoming northwest in the afternoon.
Friday Night
Partly cloudy, with a low around 42. Northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, with a high near 66. Southeast wind 5 to 10 mph.
Saturday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 53.
Sunday
Rain likely, with thunderstorms also possible after noon. Cloudy, with a high near 63. Chance of precipitation is 70%.
Sunday Night
A chance of rain and snow before midnight. Mostly cloudy, with a low around 18. Blustery. Chance of precipitation is 30%.
Monday
Sunny, with a high near 27. Blustery.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Sunny, with a high near 36.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Partly sunny, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
Last Update:
8:02 am CST Dec 25, 2025
Forecast Valid:
8am CST Dec 25, 2025-6pm CST Dec 31, 2025
 
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