National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fog/Mist

48°F

9°C

Humidity 89%
Wind Speed SE 3 mph
Barometer 30.18 in (1022.0 mb)
Dewpoint 45°F (7°C)
Visibility 6.00 mi
Last update 19 Nov 12:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Cloudy, with a high near 53. Calm wind.

    High: 53 °F

    Cloudy

  • Tonight

    Tonight: A 20 percent chance of showers after 5am. Cloudy, with a low around 47. East wind 3 to 5 mph.

    Low: 47 °F

    Cloudy then
    Slight Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 3pm. Cloudy, with a high near 60. Southeast wind 6 to 8 mph. Chance of precipitation is 40%.

    High: 60 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 9pm, then showers likely between 9pm and midnight, then rain likely after midnight. Cloudy, with a low around 49. East wind around 5 mph becoming calm. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Friday

    Friday: Rain, with thunderstorms also possible after 3pm. High near 62. East wind 6 to 10 mph. Chance of precipitation is 90%.

    High: 62 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance Rain
    then Mostly
    Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Cloudy, with a high near 53. Calm wind.
Tonight
A 20 percent chance of showers after 5am. Cloudy, with a low around 47. East wind 3 to 5 mph.
Thursday
A chance of showers, with thunderstorms also possible after 3pm. Cloudy, with a high near 60. Southeast wind 6 to 8 mph. Chance of precipitation is 40%.
Thursday Night
Showers likely and possibly a thunderstorm before 9pm, then showers likely between 9pm and midnight, then rain likely after midnight. Cloudy, with a low around 49. East wind around 5 mph becoming calm. Chance of precipitation is 70%.
Friday
Rain, with thunderstorms also possible after 3pm. High near 62. East wind 6 to 10 mph. Chance of precipitation is 90%.
Friday Night
A 50 percent chance of rain before midnight. Mostly cloudy, with a low around 44.
Saturday
Mostly sunny, with a high near 61.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Mostly sunny, with a high near 64.
Sunday Night
Partly cloudy, with a low around 41.
Monday
A 20 percent chance of rain. Partly sunny, with a high near 62.
Monday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 41.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 57.
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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:
11:06 am CST Nov 19, 2025
Forecast Valid:
1pm CST Nov 19, 2025-6pm CST Nov 25, 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