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

71°F

22°C

Humidity 90%
Wind Speed S 3 mph
Barometer 29.81 in (1008.8 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 18 Jun 1:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Mostly cloudy, with a low around 72. South wind around 9 mph.

    Low: 72 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 5pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 85. Southwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 85 °F

    Chance
    T-storms then
    Heavy Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 66. West wind 6 to 13 mph.

    Low: 66 °F

    Chance
    T-storms then
    Partly Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 85. Northwest wind 5 to 7 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. Light and variable wind.

    Low: 67 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 72. South wind around 9 mph.
Wednesday
Showers and thunderstorms likely, mainly after 5pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 85. Southwest wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 66. West wind 6 to 13 mph.
Juneteenth
Sunny, with a high near 85. Northwest wind 5 to 7 mph.
Thursday Night
Mostly clear, with a low around 67. Light and variable wind.
Friday
Sunny, with a high near 91.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 95.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny, with a high near 95.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
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Forecast Area
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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:
10:52 pm CDT Jun 17, 2025
Forecast Valid:
2am CDT Jun 18, 2025-6pm CDT Jun 24, 2025
 
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