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

73°F

23°C

Humidity 59%
Wind Speed S 7 mph
Barometer 29.72 in (1006.0 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 23 Apr 8:54 pm CDT
Extended Forecast for

St. Charles County Smartt Airport MO

Flood Warning until further notice
Click here for hazard details and duration
Flood Warning until further notice
  •  
    Flood Warning until further notice

    NOW until further notice

    Flood Warning

  • Tonight

    Low: 60 °F

    Partly Cloudy
    then Showers

  • Friday

    Friday: Showers and thunderstorms, mainly before 9am. High near 76. South wind 8 to 10 mph becoming west in the afternoon. Chance of precipitation is 80%.

    High: 76 °F

    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming clear, with a low around 49. North wind 5 to 7 mph.

    Low: 49 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 79. East wind 5 to 8 mph.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 52. East wind around 8 mph.

    Low: 52 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.

    Low: 60 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 81. Breezy. Chance of precipitation is 80%.

    High: 81 °F

    Showers
    Likely then
    T-storms and
    Breezy

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 60. South wind 9 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Friday
Showers and thunderstorms, mainly before 9am. High near 76. South wind 8 to 10 mph becoming west in the afternoon. Chance of precipitation is 80%.
Friday Night
Mostly cloudy, then gradually becoming clear, with a low around 49. North wind 5 to 7 mph.
Saturday
Sunny, with a high near 79. East wind 5 to 8 mph.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 52. East wind around 8 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Monday
Showers and possibly a thunderstorm. High near 81. Breezy. Chance of precipitation is 80%.
Monday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 52. Chance of precipitation is 40%.
Tuesday
Sunny, with a high near 73.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 48.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 72.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 48.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 68.
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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:
7:26 pm CDT Apr 23, 2026
Forecast Valid:
9pm CDT Apr 23, 2026-6pm CDT Apr 30, 2026
 
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