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.

Partly Cloudy

80°F

27°C

Humidity 62%
Wind Speed NW 12 mph
Barometer 30.08 in (1018.0 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 17 Aug 11:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 84. Northwest wind around 10 mph.

    High: 84 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly clear, with a low around 64. North wind around 6 mph becoming calm in the evening.

    Low: 64 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the morning.

    High: 87 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, mainly after 1am. Increasing clouds, with a low around 68. Southeast wind 5 to 7 mph. Chance of precipitation is 70%.

    Low: 68 °F

    Partly Cloudy
    then T-storms
    Likely

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 84. Southwest wind 6 to 8 mph becoming northeast in the afternoon.

    High: 84 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.

    Low: 67 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 82.

    High: 82 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 84. Northwest wind around 10 mph.
Tonight
Patchy fog after 4am. Otherwise, mostly clear, with a low around 64. North wind around 6 mph becoming calm in the evening.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the morning.
Tuesday Night
Showers and thunderstorms likely, mainly after 1am. Increasing clouds, with a low around 68. Southeast wind 5 to 7 mph. Chance of precipitation is 70%.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 84. Southwest wind 6 to 8 mph becoming northeast in the afternoon.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Thursday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 64.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 65.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Mostly sunny, with a high near 83.
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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:
11:51 am CDT Aug 17, 2026
Forecast Valid:
12pm CDT Aug 17, 2026-6pm CDT Aug 23, 2026
 
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Additional Resources

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Chance of Precipitation