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.

A Few Clouds

84°F

29°C

Humidity 53%
Wind Speed S 17 G 29 mph
Barometer 29.79 in (1008.4 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 17 Apr 1:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. South wind around 17 mph, with gusts as high as 26 mph.

    High: 86 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms. Low around 47. South wind 10 to 14 mph becoming west after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 100%.

    Low: 47 °F

    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers before 8am. Cloudy through mid morning, then gradual clearing, with a high near 59. Northwest wind around 17 mph, with gusts as high as 26 mph.

    High: 59 °F

    Chance
    Showers then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39. Northwest wind 8 to 13 mph becoming light west. Winds could gust as high as 20 mph.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 66. West wind 5 to 13 mph, with gusts as high as 21 mph.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. South wind around 17 mph, with gusts as high as 26 mph.
Tonight
Showers and thunderstorms. Low around 47. South wind 10 to 14 mph becoming west after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 100%.
Saturday
A 30 percent chance of showers before 8am. Cloudy through mid morning, then gradual clearing, with a high near 59. Northwest wind around 17 mph, with gusts as high as 26 mph.
Saturday Night
Clear, with a low around 39. Northwest wind 8 to 13 mph becoming light west. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 66. West wind 5 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 42.
Monday
Sunny, with a high near 71.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 57.
Wednesday
Sunny, with a high near 81.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
1:16 pm CDT Apr 17, 2026
Forecast Valid:
2pm CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation