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.

Overcast

52°F

11°C

Humidity 97%
Wind Speed W 5 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 51°F (11°C)
Visibility 7.00 mi
Wind Chill51°F (11°C)
Last update 4 Mar 9:54 pm CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11pm. Patchy fog. Low around 51. Light and variable wind becoming southeast around 5 mph. Chance of precipitation is 100%.

    Low: 51 °F

    T-storms and
    Patchy Fog
    then Showers
    and Patchy
    Fog

  • Thursday

    Thursday: A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 10am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 66. Northwest wind 5 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 50%.

    High: 66 °F

    Chance
    Showers and
    Patchy Fog
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 55. East wind 3 to 8 mph.

    Low: 55 °F

    Chance
    T-storms

  • Friday

    Friday: Scattered showers, mainly before noon. Partly sunny, with a high near 78. South wind 9 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.

    High: 78 °F

    Scattered
    Showers

  • Friday Night

    Friday Night: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 56. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.

    Low: 56 °F

    Scattered
    T-storms then
    Showers

  • Saturday

    Saturday: Scattered showers before noon. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.

    High: 65 °F

    Scattered
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11pm. Patchy fog. Low around 51. Light and variable wind becoming southeast around 5 mph. Chance of precipitation is 100%.
Thursday
A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 10am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 66. Northwest wind 5 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 50%.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 55. East wind 3 to 8 mph.
Friday
Scattered showers, mainly before noon. Partly sunny, with a high near 78. South wind 9 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 30%.
Friday Night
Scattered showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 56. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.
Saturday
Scattered showers before noon. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Sunny, with a high near 65.
Sunday Night
Mostly clear, with a low around 47.
Monday
Sunny, with a high near 78.
Monday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Tuesday
Showers and possibly a thunderstorm. High near 76. Chance of precipitation is 80%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 47. Chance of precipitation is 90%.
Wednesday
Showers likely. Mostly cloudy, with a high near 57. Chance of precipitation is 60%.
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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:
10:26 pm CST Mar 4, 2026
Forecast Valid:
10pm CST Mar 4, 2026-6pm CDT Mar 11, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation