National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

73°F

23°C

Humidity 62%
Wind Speed W 14 mph
Barometer 29.69 in (1005.1 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 15 Nov 10:54 am CST
Extended Forecast for

Portage Des Sioux MO

  • Today

    Today: Sunny, with a high near 79. West wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 79 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 42. North wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59. North wind 5 to 9 mph.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. Light and variable wind.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning. Winds could gust as high as 21 mph.

    High: 59 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers likely before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 61.

    High: 61 °F

    Chance Rain

Detailed Forecast

Today
Sunny, with a high near 79. West wind 10 to 16 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 42. North wind 6 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 59. North wind 5 to 9 mph.
Sunday Night
Mostly clear, with a low around 35. Light and variable wind.
Monday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning. Winds could gust as high as 21 mph.
Monday Night
Showers likely before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 46. Chance of precipitation is 70%.
Tuesday
Partly sunny, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 43.
Wednesday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 61.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.
Thursday
Rain. High near 63. Chance of precipitation is 80%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 50. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 63.
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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:
10:42 am CST Nov 15, 2025
Forecast Valid:
11am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation