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

70°F

21°C

Humidity 82%
Wind Speed Calm
Barometer 30.04 in (1016.7 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 19 Jun 8:54 am CDT
Extended Forecast for

2 Miles SSW Portage Des Sioux MO

  • Juneteenth

    Juneteenth: Increasing clouds, with a high near 83. Calm wind becoming northwest around 5 mph.

    High: 83 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 65. Light and variable wind.

    Low: 65 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers before 8am. Mostly sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67. Southeast wind around 6 mph.

    Low: 67 °F

    Partly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms. High near 84. Southeast wind 9 to 17 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.

    High: 84 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms. Low around 65. Chance of precipitation is 80%.

    Low: 65 °F

    T-storms

  • Monday

    Monday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Increasing clouds, with a high near 83. Calm wind becoming northwest around 5 mph.
Tonight
Mostly cloudy, with a low around 65. Light and variable wind.
Saturday
A 20 percent chance of showers before 8am. Mostly sunny, with a high near 86. Light and variable wind.
Saturday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67. Southeast wind around 6 mph.
Sunday
Showers and thunderstorms. High near 84. Southeast wind 9 to 17 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms. Low around 65. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Mostly sunny, with a high near 83.
Wednesday Night
Mostly clear, with a low around 63.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Portage Des Sioux MO
 38.89°N 90.36°W (Elev. 427 ft)
Last Update:
8:41 am CDT Jun 19, 2026
Forecast Valid:
9am CDT Jun 19, 2026-6pm CDT Jun 25, 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