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.

Mostly Cloudy

65°F

18°C

Humidity 87%
Wind Speed NE 6 mph
Barometer 29.91 in (1012.5 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 31 Mar 11:54 pm CDT
Extended Forecast for

St. Charles County Smartt Airport MO

  • Overnight

    Overnight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 54. North wind 5 to 7 mph. Chance of precipitation is 80%.

    Low: 54 °F

    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 71. Northeast wind 6 to 10 mph becoming southeast in the afternoon. Chance of precipitation is 70%.

    High: 71 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 61. Southeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    Low: 61 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 79. Breezy, with a south wind 17 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 90%.

    High: 79 °F

    Breezy.
    Chance
    Showers then
    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 56. Southwest wind 6 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    Low: 56 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 50. Chance of precipitation is 90%.

    Low: 50 °F

    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.

    High: 61 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 34.

    Low: 34 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 54. North wind 5 to 7 mph. Chance of precipitation is 80%.
Wednesday
Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 71. Northeast wind 6 to 10 mph becoming southeast in the afternoon. Chance of precipitation is 70%.
Wednesday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 61. Southeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 79. Breezy, with a south wind 17 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 90%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 56. Southwest wind 6 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 50%.
Friday Night
Showers and possibly a thunderstorm. Low around 50. Chance of precipitation is 90%.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 32.
Monday
Sunny, with a high near 64.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Sunny, with a high near 68.
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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:
9:56 pm CDT Mar 31, 2026
Forecast Valid:
12am CDT Apr 1, 2026-6pm CDT Apr 7, 2026
 
Forecast Discussion
 
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Additional Resources

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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