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

91°F

33°C

Humidity 54%
Wind Speed S 9 mph
Barometer 29.82 in (1008.6 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 20 Jul 5:51 pm CDT
Extended Forecast for

Brentwood MO

Heat Advisory July 20, 06:07pm until July 21, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 20, 06:07pm until July 21, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Tonight

    Low: 80 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 8am. Mostly cloudy through mid morning, then gradual clearing, with a high near 96. Heat index values as high as 106. Northwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 96 °F

    Slight Chance
    T-storms then
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70. North wind 6 to 13 mph.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. North wind 6 to 9 mph.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 65. North wind 5 to 9 mph becoming light northeast after midnight.

    Low: 65 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 80. South wind around 6 mph becoming southwest after midnight.
Tuesday
A 20 percent chance of showers and thunderstorms before 8am. Mostly cloudy through mid morning, then gradual clearing, with a high near 96. Heat index values as high as 106. Northwest wind 6 to 13 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 70. North wind 6 to 13 mph.
Wednesday
Sunny, with a high near 84. North wind 6 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 65. North wind 5 to 9 mph becoming light northeast after midnight.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Mostly cloudy, with a low around 65.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 20%.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Sunny, with a high near 95.
Sunday Night
Mostly clear, with a low around 76.
Monday
Mostly sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brentwood MO
 38.62°N 90.35°W (Elev. 499 ft)
Last Update:
5:56 pm CDT Jul 20, 2026
Forecast Valid:
6pm CDT Jul 20, 2026-6pm CDT Jul 27, 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