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

63°F

17°C

Humidity 41%
Wind Speed S 12 mph
Barometer 30.20 in (1022.7 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 8 Apr 10:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Today

    Today: Mostly sunny, with a high near 75. South wind 13 to 18 mph, with gusts as high as 26 mph.

    High: 75 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 52. South wind 10 to 14 mph.

    Low: 52 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 78. South wind 8 to 10 mph.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 57. South wind 6 to 10 mph.

    Low: 57 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely and possibly a thunderstorm. 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 51. Chance of precipitation is 50%.

    Low: 51 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. Chance of precipitation is 30%.

    High: 73 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 75. South wind 13 to 18 mph, with gusts as high as 26 mph.
Tonight
Mostly clear, with a low around 52. South wind 10 to 14 mph.
Thursday
Mostly sunny, with a high near 78. South wind 8 to 10 mph.
Thursday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 57. South wind 6 to 10 mph.
Friday
Showers likely and possibly a thunderstorm. 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 51. Chance of precipitation is 50%.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 57.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, 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. Partly sunny, with a high near 82. Breezy.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Tuesday
Showers and thunderstorms likely. Partly sunny, with a high near 81. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
Last Update:
10:46 am CDT Apr 8, 2026
Forecast Valid:
11am CDT Apr 8, 2026-6pm CDT Apr 14, 2026
 
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