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.

A Few Clouds

95°F

35°C

Humidity 64%
Wind Speed Calm
Barometer 29.91 in (1012.4 mb)
Dewpoint 81°F (27°C)
Visibility 10.00 mi
Heat Index117°F (47°C)
Last update 26 Jul 12:53 pm CDT
Extended Forecast for

4 Miles WSW Arnold MO

Extreme Heat Warning until July 27, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning until July 27, 09:00pm

    NOW until 9:00pm Mon

    Extreme Heat Warning

  • This Afternoon

    High: 98 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 9pm. Mostly cloudy, then gradually becoming clear, with a low around 77. Calm wind. Chance of precipitation is 20%.

    Low: 77 °F

    Isolated
    T-storms then
    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 98. Heat index values as high as 111. Southwest wind 3 to 6 mph.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 79. Southwest wind around 6 mph.

    Low: 79 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 95. West wind around 6 mph.

    High: 95 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 114. West wind 3 to 5 mph.
Tonight
Isolated showers and thunderstorms before 9pm. Mostly cloudy, then gradually becoming clear, with a low around 77. Calm wind. Chance of precipitation is 20%.
Monday
Sunny and hot, with a high near 98. Heat index values as high as 111. Southwest wind 3 to 6 mph.
Monday Night
Mostly clear, with a low around 79. Southwest wind around 6 mph.
Tuesday
Mostly sunny, with a high near 95. West wind around 6 mph.
Tuesday Night
Partly cloudy, with a low around 72.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
Mostly sunny, with a high near 90.
Thursday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 69.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Friday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Arnold MO
 38.4°N 90.44°W (Elev. 525 ft)
Last Update:
11:21 am CDT Jul 26, 2026
Forecast Valid:
12pm CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation