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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

4 Miles SSW Portage Des Sioux MO

  • Today

    Today: Mostly sunny, with a high near 59. West wind 8 to 13 mph, with gusts as high as 22 mph.

    High: 59 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 35. West wind 5 to 8 mph becoming calm after midnight.

    Low: 35 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 58. Calm wind becoming south 5 to 8 mph in the morning.

    High: 58 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after midnight. Increasing clouds, with a low around 45. South wind around 8 mph.

    Low: 45 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain. High near 62. Southeast wind 8 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.

    High: 62 °F

    Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain
    then Slight
    Chance Rain

  • Friday

    Friday: A 20 percent chance of rain. Mostly cloudy, with a high near 55.

    High: 55 °F

    Slight Chance
    Rain

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 34.

    Low: 34 °F

    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 59. West wind 8 to 13 mph, with gusts as high as 22 mph.
Tonight
Mostly clear, with a low around 35. West wind 5 to 8 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 58. Calm wind becoming south 5 to 8 mph in the morning.
Wednesday Night
A 30 percent chance of rain after midnight. Increasing clouds, with a low around 45. South wind around 8 mph.
Thursday
Rain. High near 62. Southeast wind 8 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.
Thursday Night
A 50 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 45.
Friday
A 20 percent chance of rain. Mostly cloudy, with a high near 55.
Friday Night
A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 34.
Saturday
Mostly sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Sunny, with a high near 40.
Sunday Night
Mostly clear, with a low around 27.
Monday
Sunny, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Portage Des Sioux MO
 38.87°N 90.36°W (Elev. 430 ft)
Last Update:
4:51 am CST Jan 6, 2026
Forecast Valid:
5am CST Jan 6, 2026-6pm CST Jan 12, 2026
 
Forecast Discussion
 
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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