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

55°F

13°C

Humidity 23%
Wind Speed S 8 mph
Barometer 30.42 in (1030.4 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 28 Mar 4:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Tonight

    Tonight: Increasing clouds, with a low around 40. South wind around 7 mph.

    Low: 40 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 71. South wind 6 to 13 mph, with gusts as high as 21 mph.

    High: 71 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56. South wind around 10 mph.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 84. South wind 9 to 16 mph, with gusts as high as 25 mph.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 66. South wind around 14 mph, with gusts as high as 24 mph.

    Low: 66 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain, then a chance of rain and thunderstorms after 10am. Partly sunny, with a high near 85. Chance of precipitation is 50%.

    High: 85 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 45. Chance of precipitation is 80%.

    Low: 45 °F

    Rain

  • Wednesday

    Wednesday: A 50 percent chance of rain. Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 41. Chance of precipitation is 60%.

    Low: 41 °F

    Rain Likely

Detailed Forecast

Tonight
Increasing clouds, with a low around 40. South wind around 7 mph.
Sunday
Mostly sunny, with a high near 71. South wind 6 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 56. South wind around 10 mph.
Monday
Sunny, with a high near 84. South wind 9 to 16 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 66. South wind around 14 mph, with gusts as high as 24 mph.
Tuesday
A slight chance of rain, then a chance of rain and thunderstorms after 10am. Partly sunny, with a high near 85. Chance of precipitation is 50%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 45. Chance of precipitation is 80%.
Wednesday
A 50 percent chance of rain. Mostly cloudy, with a high near 55.
Wednesday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 41. Chance of precipitation is 60%.
Thursday
Rain likely, mainly before 1pm. Mostly cloudy, with a high near 56. Chance of precipitation is 60%.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 44.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 71.
Friday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 52.
Saturday
Rain likely. Mostly cloudy, with a high near 68. Chance of precipitation is 60%.
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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:
1:26 pm CDT Mar 28, 2026
Forecast Valid:
5pm CDT Mar 28, 2026-6pm CDT Apr 4, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation