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.

Fair

59°F

15°C

Humidity 24%
Wind Speed W 16 mph
Barometer 29.94 in (1013.8 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Last update 13 Mar 1:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 60. West wind 14 to 16 mph, with gusts as high as 26 mph.

    High: 60 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 36. Northwest wind 5 to 7 mph becoming light and variable.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 63. East wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 63 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 54. Southeast wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 70. Breezy, with a south wind 17 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 90%.

    High: 70 °F

    Breezy.
    Chance Rain
    then Showers

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 21. Blustery. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 21 °F

    Rain/Snow and
    Blustery

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery.

    High: 28 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 12. Blustery.

    Low: 12 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 36.

    High: 36 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 60. West wind 14 to 16 mph, with gusts as high as 26 mph.
Tonight
Partly cloudy, with a low around 36. Northwest wind 5 to 7 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 63. East wind 6 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Increasing clouds, with a low around 54. Southeast wind 10 to 14 mph, with gusts as high as 23 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 70. Breezy, with a south wind 17 to 22 mph, with gusts as high as 38 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 21. Blustery. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Monday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery.
Monday Night
Mostly clear, with a low around 12. Blustery.
Tuesday
Sunny, with a high near 36.
Tuesday Night
A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Mostly clear, with a low around 39.
Thursday
Mostly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
1:21 pm CDT Mar 13, 2026
Forecast Valid:
1pm CDT Mar 13, 2026-6pm CDT Mar 19, 2026
 
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Additional Resources

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Chance of Precipitation