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

76°F

24°C

Humidity 62%
Wind Speed S 13 mph
Barometer 29.89 in (1011.9 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 3 Apr 7:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 53. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.

    Low: 53 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 10am, then a slight chance of showers between 10am and 11am. Mostly cloudy, with a temperature falling to around 54 by noon. West wind 11 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    High: 59 °F⇓

    Showers
    Likely then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 38. West wind 8 to 15 mph, with gusts as high as 23 mph.

    Low: 38 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59. Northwest wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 40. West wind 3 to 6 mph.

    Low: 40 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 56.

    High: 56 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 53. South wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.
Saturday
Showers likely and possibly a thunderstorm before 10am, then a slight chance of showers between 10am and 11am. Mostly cloudy, with a temperature falling to around 54 by noon. West wind 11 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Saturday Night
Mostly clear, with a low around 38. West wind 8 to 15 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 59. Northwest wind 8 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 40. West wind 3 to 6 mph.
Monday
Sunny, with a high near 62.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 36.
Tuesday
Mostly cloudy, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 76.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 77.
Basemap Options
Click map to change the forecast location
Loading map...
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:
8:06 pm CDT Apr 3, 2026
Forecast Valid:
8pm CDT Apr 3, 2026-6pm CDT Apr 10, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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