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.

Partly Cloudy

68°F

20°C

Humidity 55%
Wind Speed S 3 mph
Barometer 29.93 in (1013.2 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 12 May 10:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy early, then becoming clear, with a low around 58. Southwest wind 7 to 9 mph becoming northwest after midnight.

    Low: 58 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 75. Northwest wind 8 to 14 mph, with gusts as high as 22 mph.

    High: 75 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 49. North wind 5 to 8 mph becoming calm in the evening.

    Low: 49 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 76. Calm wind becoming southeast 5 to 9 mph in the morning.

    High: 76 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 57. Southeast wind 10 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    Low: 57 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy early, then becoming clear, with a low around 58. Southwest wind 7 to 9 mph becoming northwest after midnight.
Wednesday
Sunny, with a high near 75. Northwest wind 8 to 14 mph, with gusts as high as 22 mph.
Wednesday Night
Clear, with a low around 49. North wind 5 to 8 mph becoming calm in the evening.
Thursday
Sunny, with a high near 76. Calm wind becoming southeast 5 to 9 mph in the morning.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 57. Southeast wind 10 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 66.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Monday
Showers and thunderstorms likely. Partly sunny, with a high near 90. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 70%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 84. Chance of precipitation is 60%.
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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:
9:21 pm CDT May 12, 2026
Forecast Valid:
11pm CDT May 12, 2026-6pm CDT May 19, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation