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

69°F

21°C

Humidity 93%
Wind Speed SW 3 mph
Barometer 29.86 in (1010.8 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 18 Jun 9:54 pm CDT
Extended Forecast for

Portage Des Sioux MO

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 66. West wind 6 to 8 mph, with gusts as high as 21 mph.

    Low: 66 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Juneteenth

    Juneteenth: Partly sunny, then gradually becoming sunny, with a high near 85. Northwest wind around 8 mph.

    High: 85 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. West wind around 6 mph becoming light and variable in the evening.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 91. Light south wind increasing to 5 to 10 mph in the morning.

    High: 91 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. South wind 8 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 66. West wind 6 to 8 mph, with gusts as high as 21 mph.
Juneteenth
Partly sunny, then gradually becoming sunny, with a high near 85. Northwest wind around 8 mph.
Thursday Night
Mostly clear, with a low around 68. West wind around 6 mph becoming light and variable in the evening.
Friday
Sunny, with a high near 91. Light south wind increasing to 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 75. South wind 8 to 10 mph.
Saturday
Sunny, with a high near 95.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 77.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.36°W (Elev. 407 ft)
Last Update:
9:52 pm CDT Jun 18, 2025
Forecast Valid:
10pm CDT Jun 18, 2025-6pm CDT Jun 25, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation