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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

82°F

28°C

Humidity 82%
Wind Speed S 6 mph
Barometer 29.87 in (1011.1 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 28 Jun 9:53 pm CDT
Extended Forecast for

3 Miles NNW Arnold MO

Extreme Heat Warning June 28, 10:41pm until July 3, 12:00am
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 28, 10:41pm until July 3, 12:00am

    NOW until 12:00am Fri

    Extreme Heat Warning

  • Tonight

    Low: 75 °F

    Increasing
    Clouds

  • Monday

    Monday: Sunny and hot, with a high near 97. Heat index values as high as 111. South wind 5 to 9 mph.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South wind 3 to 7 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98. Heat index values as high as 107. Calm wind becoming south 5 to 7 mph in the morning.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75. South wind around 5 mph becoming calm after midnight.

    Low: 75 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

Detailed Forecast

Tonight
Increasing clouds, with a low around 75. South wind 3 to 5 mph.
Monday
Sunny and hot, with a high near 97. Heat index values as high as 111. South wind 5 to 9 mph.
Monday Night
Mostly clear, with a low around 77. South wind 3 to 7 mph.
Tuesday
Sunny and hot, with a high near 98. Heat index values as high as 107. Calm wind becoming south 5 to 7 mph in the morning.
Tuesday Night
Clear, with a low around 75. South wind around 5 mph becoming calm after midnight.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Mostly clear, with a low around 77.
Friday
Sunny and hot, with a high near 97.
Friday Night
Mostly clear, with a low around 77.
Independence Day
Sunny and hot, with a high near 97.
Saturday Night
Mostly clear, with a low around 76.
Sunday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 95.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Arnold MO
 38.47°N 90.38°W (Elev. 476 ft)
Last Update:
10:26 pm CDT Jun 28, 2026
Forecast Valid:
10pm CDT Jun 28, 2026-6pm CDT Jul 5, 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