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

29°F

-2°C

Humidity 66%
Wind Speed E 5 mph
Barometer 29.84 in (1010.7 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 26 Feb 5:54 am CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Today

    Today: Sunny, with a high near 56. Southeast wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 56 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 36. Light south wind.

    Low: 36 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 73. Southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 23 mph.

    High: 73 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 40. Southwest wind 5 to 7 mph becoming northeast after midnight.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 63. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 63 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: A 20 percent chance of rain before midnight. Partly cloudy, with a low around 29.

    Low: 29 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Sunday

    Sunday: Rain and snow likely, mainly after noon. Cloudy, with a high near 40. Chance of precipitation is 60%.

    High: 40 °F

    Chance
    Rain/Snow
    then
    Rain/Snow
    Likely

  • Sunday Night

    Sunday Night: Rain and snow likely before midnight, then a chance of snow. Cloudy, with a low around 27. Chance of precipitation is 70%.

    Low: 27 °F

    Rain/Snow
    Likely then
    Chance Snow

  • Monday

    Monday: A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 40. Chance of precipitation is 30%.

    High: 40 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

Detailed Forecast

Today
Sunny, with a high near 56. Southeast wind 5 to 7 mph becoming light and variable in the afternoon.
Tonight
Clear, with a low around 36. Light south wind.
Friday
Sunny, with a high near 73. Southwest wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 23 mph.
Friday Night
Mostly clear, with a low around 40. Southwest wind 5 to 7 mph becoming northeast after midnight.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 63. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Saturday Night
A 20 percent chance of rain before midnight. Partly cloudy, with a low around 29.
Sunday
Rain and snow likely, mainly after noon. Cloudy, with a high near 40. Chance of precipitation is 60%.
Sunday Night
Rain and snow likely before midnight, then a chance of snow. Cloudy, with a low around 27. Chance of precipitation is 70%.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 40. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 25.
Tuesday
A 40 percent chance of rain. Cloudy, with a high near 43.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 30.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 50.
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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:
4:51 am CST Feb 26, 2026
Forecast Valid:
6am CST Feb 26, 2026-6pm CST Mar 4, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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