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

67°F

19°C

Humidity 93%
Wind Speed NE 5 mph
Barometer 30.12 in (1019.5 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 5 Aug 3:54 am CDT
Extended Forecast for

Portage Des Sioux MO

  • Today

    Today: Isolated showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 85. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 85 °F

    Patchy Fog
    then Isolated
    T-storms

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Partly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 89 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. East wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

Detailed Forecast

Today
Isolated showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 85. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 20%.
Tonight
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.
Wednesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Calm wind becoming southeast around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 68. East wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 91. Calm wind becoming southeast 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 72.
Friday
Sunny, with a high near 92.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 92.
Saturday Night
Mostly clear, with a low around 73.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.33°W (Elev. 407 ft)
Last Update:
4:31 am CDT Aug 5, 2025
Forecast Valid:
4am CDT Aug 5, 2025-6pm CDT Aug 11, 2025
 
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