Showers and Storms continue across the East; Heat, Critical Fire Weather, Drought, and Poor Air Quality continues in the West

A series of fronts will focus locally heavy showers and storms across portions of the central and eastern U.S. through the end of the workweek. Dangerous to extreme heat continues across the Southwest U.S., eventually spreading eastward over the weekend into early next week. Elevated fire weather conditions continue across the Great Basin, with degraded air quality lingering across the Northwest. Read More >

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

74°F

23°C

Humidity 82%
Wind Speed E 3 mph
Barometer 30.06 in (1017.4 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 5 Aug 7:54 am CDT
Extended Forecast for

Portage Des Sioux MO

Flood Watch August 5, 10:00pm until August 6, 10:00am
Click here for hazard details and duration
Flood Watch
  • Today

    Today: Isolated showers and thunderstorms after 4pm.  Mostly sunny, with a high near 91. South wind 5 to 8 mph.  Chance of precipitation is 20%.

    High: 91 °F

    Sunny then
    Isolated
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms, mainly after 3am.  Low around 70. Northwest wind around 6 mph becoming calm  in the evening.  Chance of precipitation is 80%.

    Low: 70 °F

    Scattered
    T-storms then
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 11am.  High near 85. Light and variable wind becoming southwest around 6 mph in the morning.  Chance of precipitation is 80%.

    High: 85 °F

    T-storms then
    Scattered
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms.  Cloudy, then gradually becoming partly cloudy, with a low around 70. East wind around 5 mph becoming calm  in the evening.

    Low: 70 °F

    Chance
    T-storms

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms.  Partly sunny, with a high near 87. Southwest wind 3 to 7 mph.

    High: 87 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am.  Partly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

Detailed Forecast

Today
Isolated showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. South wind 5 to 8 mph. Chance of precipitation is 20%.
Tonight
Showers and thunderstorms, mainly after 3am. Low around 70. Northwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%.
Thursday
Showers and thunderstorms, mainly before 11am. High near 85. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 80%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Cloudy, then gradually becoming partly cloudy, with a low around 70. East wind around 5 mph becoming calm in the evening.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind 3 to 7 mph.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 70.
Saturday
Mostly sunny, with a high near 90.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 95.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.33°W (Elev. 407 ft)
5:51 am CDT Aug 5, 2026
8am CDT Aug 5, 2026-6pm CDT Aug 11, 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