National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

73°F

23°C

Humidity 74%
Wind Speed Calm
Barometer 30.16 in (1020.4 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 28 Aug 8:51 am CDT
Extended Forecast for

Clayton MO

  • Today

    Today: Sunny, with a high near 87. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 66. Light southeast wind.

    Low: 66 °F

    Mostly Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 89. Calm wind becoming south 5 to 7 mph in the morning.

    High: 89 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 70. South wind around 7 mph.

    Low: 70 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 95. South wind 6 to 9 mph.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99.

    High: 99 °F

    Hot

Detailed Forecast

Today
Sunny, with a high near 87. Calm wind becoming northeast around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 66. Light southeast wind.
Saturday
Increasing clouds, with a high near 89. Calm wind becoming south 5 to 7 mph in the morning.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 70. South wind around 7 mph.
Sunday
Sunny, with a high near 95. South wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny and hot, with a high near 98.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny and hot, with a high near 99.
Tuesday Night
Mostly clear, with a low around 80.
Wednesday
Sunny and hot, with a high near 99.
Wednesday Night
Mostly clear, with a low around 80.
Thursday
A 20 percent chance of showers. Sunny and hot, with a high near 99.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clayton MO
 38.64°N 90.32°W (Elev. 558 ft)
Last Update:
6:21 am CDT Aug 28, 2026
Forecast Valid:
9am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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