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

69°F

21°C

Humidity 35%
Wind Speed S 12 mph
Barometer 30.04 in (1017.2 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 8 Apr 7:54 pm CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: Mostly clear, with a low around 52. South wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80. Southwest wind 8 to 11 mph.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Increasing clouds, with a low around 56. South wind around 10 mph.

    Low: 56 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 70. Southwest wind 8 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 70%.

    High: 70 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 49. Northeast wind around 7 mph. Chance of precipitation is 40%.

    Low: 49 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 74.

    High: 74 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80.

    High: 80 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 52. South wind 7 to 11 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 80. Southwest wind 8 to 11 mph.
Thursday Night
A 20 percent chance of showers after 1am. Increasing clouds, with a low around 56. South wind around 10 mph.
Friday
Showers likely, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 70. Southwest wind 8 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 49. Northeast wind around 7 mph. Chance of precipitation is 40%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 74.
Saturday Night
Mostly cloudy, with a low around 59.
Sunday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80.
Sunday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 62.
Monday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 84.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 70.
Basemap Options
Click map to change the forecast location
Loading map...
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:
6:46 pm CDT Apr 8, 2026
Forecast Valid:
8pm CDT Apr 8, 2026-6pm CDT Apr 15, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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