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 and Breezy

78°F

26°C

Humidity 24%
Wind Speed S 21 G 30 mph
Barometer 30.04 in (1016.9 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 8 Apr 4:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Tonight

    Tonight: Mostly clear, with a low around 55. South wind 7 to 15 mph, with gusts as high as 22 mph.

    Low: 55 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80. Southwest wind 6 to 10 mph.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Increasing clouds, with a low around 59. South wind 8 to 10 mph.

    Low: 59 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Southwest wind 7 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 70%.

    High: 71 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 51. East wind around 6 mph. Chance of precipitation is 40%.

    Low: 51 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 74.

    High: 74 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 61.

    Low: 61 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79.

    High: 79 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 55. South wind 7 to 15 mph, with gusts as high as 22 mph.
Thursday
Sunny, with a high near 80. Southwest wind 6 to 10 mph.
Thursday Night
A 20 percent chance of showers after 1am. Increasing clouds, with a low around 59. South wind 8 to 10 mph.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Southwest wind 7 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 70%.
Friday Night
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 51. East wind around 6 mph. Chance of precipitation is 40%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 74.
Saturday Night
Mostly cloudy, with a low around 61.
Sunday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79.
Sunday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Monday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 85.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
2:41 pm CDT Apr 8, 2026
Forecast Valid:
5pm CDT Apr 8, 2026-6pm CDT Apr 15, 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