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.

Mostly Cloudy

82°F

28°C

Humidity 69%
Wind Speed S 5 mph
Barometer 30.23 in (1022.2 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 16 Sep 10:51 pm CDT
Extended Forecast for

Brentwood MO

Heat Advisory September 16, 11:33pm until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 16, 11:33pm until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 77 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm. Sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind 3 to 7 mph. Chance of precipitation is 20%.

    High: 99 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 75. South wind around 5 mph becoming calm in the evening.

    Low: 75 °F

    Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms between 1pm and 2pm. Sunny and hot, with a high near 97. Heat index values as high as 104. South wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 20%.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. South wind 3 to 5 mph.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 93. Chance of precipitation is 20%.

    High: 93 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 77. Light south wind.
Thursday
A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm. Sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind 3 to 7 mph. Chance of precipitation is 20%.
Thursday Night
A 30 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 75. South wind around 5 mph becoming calm in the evening.
Friday
A slight chance of showers and thunderstorms between 1pm and 2pm. Sunny and hot, with a high near 97. Heat index values as high as 104. South wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 76. South wind 3 to 5 mph.
Saturday
Mostly sunny and hot, with a high near 98.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 93. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 20%.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. Chance of precipitation is 30%.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 66.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Brentwood MO
 38.62°N 90.35°W (Elev. 499 ft)
Last Update:
10:46 pm CDT Sep 16, 2026
Forecast Valid:
11pm CDT Sep 16, 2026-6pm CDT Sep 23, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation