Showers and Storms in the East; Dangerously Hot and Dry in the West

A frontal boundary will bring scattered showers and storms to portions of the Central and Eastern U.S. through the end of the week. Meanwhile, dangerous heat will intensify across the Intermountain West and expand into the Central U.S. by early next week. Elevated wildfire conditions will develop across portions of the Northern/Central Plains and air quality issues will persist in the Northwest. Read More >

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

A Few Clouds

74°F

23°C

Humidity 91%
Wind Speed N 3 mph
Barometer 30.03 in (1016.5 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 5 Aug 11:54 pm CDT
Extended Forecast for

Portage Des Sioux MO

Flood Watch until August 6, 10:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until August 6, 10:00am

    NOW until 10:00am Thu

    Flood Watch

  • Overnight

    Low: 71 °F

    Heavy Rain

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 10am. Some of the storms could produce heavy rainfall.  High near 84. South wind 3 to 6 mph.  Chance of precipitation is 80%.

    High: 84 °F

    Heavy Rain
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 11pm.  Increasing clouds, with a low around 71. Light southeast wind.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms.  Partly sunny, with a high near 88. South wind 5 to 7 mph becoming southwest in the afternoon.

    High: 88 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am.  Partly cloudy, with a low around 72. South wind 3 to 6 mph.

    Low: 72 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers and thunderstorms, mainly after 3am. Some of the storms could produce heavy rainfall. Low around 71. Light and variable wind. Chance of precipitation is 80%.
Thursday
Showers and thunderstorms, mainly before 10am. Some of the storms could produce heavy rainfall. High near 84. South wind 3 to 6 mph. Chance of precipitation is 80%.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 11pm. Increasing clouds, with a low around 71. Light southeast wind.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. South wind 5 to 7 mph becoming southwest in the afternoon.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72. South wind 3 to 6 mph.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Mostly sunny, with a high near 93.
Sunday Night
Mostly clear, with a low around 76.
Monday
Mostly sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.36°W (Elev. 407 ft)
9:36 pm CDT Aug 5, 2026
12am CDT Aug 6, 2026-6pm CDT Aug 12, 2026
 
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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