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.

Mostly Cloudy

36°F

2°C

Humidity 67%
Wind Speed E 9 mph
Barometer 30.19 in (1022.5 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 12 Feb 9:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • Tonight

    Tonight: Partly cloudy, with a low around 30. East wind 5 to 7 mph.

    Low: 30 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 59. South wind 5 to 8 mph.

    High: 59 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 34. Southeast wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Rain, mainly after noon. High near 53. Calm wind becoming southeast 5 to 9 mph in the morning. Chance of precipitation is 80%.

    High: 53 °F

    Chance Rain
    then Rain

  • Saturday Night

    Saturday Night: Rain. Low around 39. East wind around 8 mph. Chance of precipitation is 80%.

    Low: 39 °F

    Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 30. East wind 5 to 7 mph.
Friday
Sunny, with a high near 59. South wind 5 to 8 mph.
Friday Night
Increasing clouds, with a low around 34. Southeast wind around 5 mph becoming calm in the evening.
Saturday
Rain, mainly after noon. High near 53. Calm wind becoming southeast 5 to 9 mph in the morning. Chance of precipitation is 80%.
Saturday Night
Rain. Low around 39. East wind around 8 mph. Chance of precipitation is 80%.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 34.
Washington's Birthday
Mostly sunny, with a high near 63.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly cloudy, with a high near 66.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 70.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 41.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 60.
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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 CST Feb 12, 2026
Forecast Valid:
9pm CST Feb 12, 2026-6pm CST Feb 19, 2026
 
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Additional Resources

Radar & Satellite Image

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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