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.

Overcast

66°F

19°C

Humidity 87%
Wind Speed N 10 G 24 mph
Barometer 29.92 in (1012.7 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 31 Mar 10:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Tonight

    Tonight: Showers and possibly a thunderstorm. Low around 57. North wind 5 to 7 mph. Chance of precipitation is 80%.

    Low: 57 °F

    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 72. Northeast wind 5 to 9 mph becoming southeast in the afternoon. Chance of precipitation is 70%.

    High: 72 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 64. Southeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 78. Breezy, with a south wind 17 to 23 mph, with gusts as high as 36 mph. Chance of precipitation is 80%.

    High: 78 °F

    Breezy.
    Chance
    Showers then
    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 58. Southwest wind 6 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    Low: 58 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 52. Chance of precipitation is 90%.

    Low: 52 °F

    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.

    High: 63 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 37.

    Low: 37 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Low around 57. North wind 5 to 7 mph. Chance of precipitation is 80%.
Wednesday
Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 72. Northeast wind 5 to 9 mph becoming southeast in the afternoon. Chance of precipitation is 70%.
Wednesday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 64. Southeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 78. Breezy, with a south wind 17 to 23 mph, with gusts as high as 36 mph. Chance of precipitation is 80%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 58. Southwest wind 6 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 50%.
Friday Night
Showers and possibly a thunderstorm. Low around 52. Chance of precipitation is 90%.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 55.
Sunday Night
Mostly clear, with a low around 34.
Monday
Sunny, with a high near 64.
Monday Night
Mostly clear, with a low around 42.
Tuesday
Sunny, with a high near 69.
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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:
9:56 pm CDT Mar 31, 2026
Forecast Valid:
11pm CDT Mar 31, 2026-6pm CDT Apr 7, 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