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. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

76°F

24°C

Humidity 82%
Wind Speed S 5 mph
Barometer 30.04 in (1016.7 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 5 Aug 10:53 pm CDT
Extended Forecast for

Arnold 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

  • Tonight

    Low: 72 °F

    T-storms
    Likely

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 2pm.  Mostly cloudy, with a high near 85. Light and variable wind.  Chance of precipitation is 70%.

    High: 85 °F

    T-storms
    Likely

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 10pm.  Mostly cloudy, with a low around 71. Calm wind.

    Low: 71 °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 5 mph.

    High: 87 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 72. Light south wind.

    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 72.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly after 4am. Mostly cloudy, with a low around 72. Light and variable wind. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, with a high near 85. Light and variable wind. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 10pm. Mostly cloudy, with a low around 71. Calm wind.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind 3 to 5 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Light south wind.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
Mostly clear, with a low around 72.
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
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.42°N 90.35°W (Elev. 400 ft)
9:36 pm CDT Aug 5, 2026
11pm CDT Aug 5, 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