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.

A Few Clouds

70°F

21°C

Humidity 68%
Wind Speed NE 12 mph
Barometer 30.10 in (1018.7 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 22 Jul 11:54 pm CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Mostly cloudy, with a low around 62. Northeast wind 3 to 5 mph.

    Low: 62 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 83. East wind 3 to 7 mph.

    High: 83 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 64. East wind 5 to 8 mph becoming calm after midnight.

    Low: 64 °F

    Mostly Cloudy

  • Friday

    Friday: A 50 percent chance of showers, mainly after 7am. Mostly cloudy, with a high near 80. Southeast wind 3 to 7 mph.

    High: 80 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 8 mph.

    Low: 65 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms before 10am. Partly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 96.

    High: 96 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 62. Northeast wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 83. East wind 3 to 7 mph.
Thursday Night
Mostly cloudy, with a low around 64. East wind 5 to 8 mph becoming calm after midnight.
Friday
A 50 percent chance of showers, mainly after 7am. Mostly cloudy, with a high near 80. Southeast wind 3 to 7 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 8 mph.
Saturday
A 30 percent chance of showers and thunderstorms before 10am. Partly sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Mostly sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Mostly sunny, with a high near 94.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 73.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.93°N 90.42°W (Elev. 427 ft)
Last Update:
9:36 pm CDT Jul 22, 2026
Forecast Valid:
12am CDT Jul 23, 2026-6pm CDT Jul 29, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation