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.

Fair

64°F

18°C

Humidity 33%
Wind Speed S 12 mph
Barometer 29.90 in (1012.5 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 7 Jan 1:54 pm CST
Extended Forecast for

St. Charles County Smartt Airport MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 63. South wind around 9 mph.

    High: 63 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 42. Southeast wind 7 to 9 mph.

    Low: 42 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Rain likely before noon, then showers, mainly after 3pm. High near 63. Southeast wind 9 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 80%.

    High: 63 °F

    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Cloudy, then gradually becoming partly cloudy, with a low around 46. South wind 10 to 16 mph becoming west after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 53. West wind 7 to 10 mph becoming north in the afternoon.

    High: 53 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before noon. Partly sunny, with a high near 42.

    High: 42 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 63. South wind around 9 mph.
Tonight
Increasing clouds, with a low around 42. Southeast wind 7 to 9 mph.
Thursday
Rain likely before noon, then showers, mainly after 3pm. High near 63. Southeast wind 9 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 80%.
Thursday Night
Showers likely and possibly a thunderstorm. Cloudy, then gradually becoming partly cloudy, with a low around 46. South wind 10 to 16 mph becoming west after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 70%.
Friday
Partly sunny, with a high near 53. West wind 7 to 10 mph becoming north in the afternoon.
Friday Night
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 34.
Saturday
A 20 percent chance of rain before noon. Partly sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 22.
Sunday
Mostly sunny, with a high near 34.
Sunday Night
Mostly clear, with a low around 21.
Monday
Sunny, with a high near 47.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Mostly sunny, with a high near 50.
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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:
1:11 pm CST Jan 7, 2026
Forecast Valid:
2pm CST Jan 7, 2026-6pm CST Jan 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation