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.

Light Rain

67°F

19°C

Humidity 93%
Wind Speed SE 7 mph
Barometer 29.90 in (1011.8 mb)
Dewpoint 65°F (18°C)
Visibility 7.00 mi
Last update 22 Sep 3:54 am CDT
Extended Forecast for

Portage Des Sioux MO

  • Overnight

    Overnight: A 50 percent chance of showers. Mostly cloudy, with a low around 65. South wind around 6 mph.

    Low: 65 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 2pm. Mostly cloudy, with a high near 79. South wind 5 to 7 mph. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. Light southeast wind.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 50%.

    High: 81 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. South wind around 5 mph becoming light and variable. Chance of precipitation is 70%.

    Low: 65 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 1pm. High near 77. Chance of precipitation is 80%.

    High: 77 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 61.

    Low: 61 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Chance of precipitation is 40%.

    High: 75 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 58.

    Low: 58 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
A 50 percent chance of showers. Mostly cloudy, with a low around 65. South wind around 6 mph.
Monday
A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 2pm. Mostly cloudy, with a high near 79. South wind 5 to 7 mph. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 65. Light southeast wind.
Tuesday
A slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 50%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. South wind around 5 mph becoming light and variable. Chance of precipitation is 70%.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 1pm. High near 77. Chance of precipitation is 80%.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 61.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 58.
Friday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 57.
Saturday
Sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.33°W (Elev. 407 ft)
Last Update:
4:16 am CDT Sep 22, 2025
Forecast Valid:
4am CDT Sep 22, 2025-6pm CDT Sep 28, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation