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

67°F

19°C

Humidity 81%
Wind Speed SW 6 mph
Barometer 29.87 in (1011.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 14 Apr 3:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. South wind around 13 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. Southwest wind 10 to 17 mph, with gusts as high as 26 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. South wind 11 to 15 mph, with gusts as high as 23 mph.

    Low: 67 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 10am. High near 81. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 60. Southwest wind 8 to 11 mph. Chance of precipitation is 80%.

    Low: 60 °F

    Showers

  • Thursday

    Thursday: Showers likely before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 56. Chance of precipitation is 70%.

    Low: 56 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. South wind around 13 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 89. Southwest wind 10 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. South wind 11 to 15 mph, with gusts as high as 23 mph.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 10am. High near 81. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 60. Southwest wind 8 to 11 mph. Chance of precipitation is 80%.
Thursday
Showers likely before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Thursday Night
Mostly clear, with a low around 57.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 56. Chance of precipitation is 70%.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 69. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Sunny, with a high near 64.
Sunday Night
Mostly clear, with a low around 41.
Monday
Sunny, with a high near 70.
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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:
2:51 am CDT Apr 14, 2026
Forecast Valid:
4am CDT Apr 14, 2026-6pm CDT Apr 20, 2026
 
Forecast Discussion
 
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Additional Resources

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