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

80°F

27°C

Humidity 45%
Wind Speed NW 8 mph
Barometer 30.02 in (1016.1 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Jun 11:54 am CDT
Extended Forecast for

3 Miles ENE Portage Des Sioux MO

  • Juneteenth

    Juneteenth: Sunny, with a high near 84. Light northwest wind.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Isolated showers after 3am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 20%.

    Low: 65 °F

    Mostly Cloudy
    then Isolated
    Showers

  • Saturday

    Saturday: Isolated showers before 9am. Mostly sunny, with a high near 86. Light and variable wind. Chance of precipitation is 20%.

    High: 86 °F

    Isolated
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 67. North wind around 5 mph becoming light and variable. Chance of precipitation is 50%.

    Low: 67 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. High near 84. Southeast wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 24 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
Sunny, with a high near 84. Light northwest wind.
Tonight
Isolated showers after 3am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 20%.
Saturday
Isolated showers before 9am. Mostly sunny, with a high near 86. Light and variable wind. Chance of precipitation is 20%.
Saturday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 67. North wind around 5 mph becoming light and variable. Chance of precipitation is 50%.
Sunday
Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. High near 84. Southeast wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 24 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
Partly cloudy, with a low around 63.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
10:36 am CDT Jun 19, 2026
Forecast Valid:
12pm 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