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

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Fair

24°C

76°F

Humidity 79%
Wind Speed SW 19 km/h
Barometer 1015.4 mb (30.03 in)
Dewpoint 21°C (69°F)
Visibility 16 km
Heat Index25°C (77°F)
Last update 8 Aug 2:51 am CDT
Extended Forecast for

Brentwood MO

Extreme Heat Watch August 9, 12:00pm until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • Overnight

    Overnight: Mostly clear, with a low around 22. Calm wind.

    Low: 22 °C

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 33. Heat index values as high as 39. Calm wind.

    High: 33 °C

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 23. Calm wind.

    Low: 23 °C

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 34. Heat index values as high as 41. South wind 5 to 14 km/h.

    High: 34 °C

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 24. South wind 10 to 13 km/h.

    Low: 24 °C

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 36.

    High: 36 °C

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 26.

    Low: 26 °C

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 36.

    High: 36 °C

    Hot

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 25.

    Low: 25 °C

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 22. Calm wind.
Saturday
Sunny, with a high near 33. Heat index values as high as 39. Calm wind.
Saturday Night
Mostly clear, with a low around 23. Calm wind.
Sunday
Sunny, with a high near 34. Heat index values as high as 41. South wind 5 to 14 km/h.
Sunday Night
Mostly clear, with a low around 24. South wind 10 to 13 km/h.
Monday
Sunny and hot, with a high near 36.
Monday Night
Mostly clear, with a low around 26.
Tuesday
Sunny and hot, with a high near 36.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 25.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 34.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 23.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 31.
Thursday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 22. Chance of precipitation is 60%.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood MO
 38.62°N 90.35°W (Elev. 499 m)
Last Update:
2:11 am CDT Aug 8, 2026
Forecast Valid:
3am CDT Aug 8, 2026-6pm CDT Aug 14, 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