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Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

84°F

29°C

Humidity 70%
Wind Speed S 7 mph
Barometer 30.06 in (1016.5 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 3 Jul 12:51 am CDT
Extended Forecast for

Lambert-St. Louis International Airport MO

Extreme Heat Warning July 3, 01:39am until July 4, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 3, 01:39am until July 4, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Overnight

    Low: 78 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Heat index values as high as 102. Light south wind becoming southeast 5 to 9 mph in the morning.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 77. South wind 5 to 8 mph becoming light and variable.

    Low: 77 °F

    Partly Cloudy

  • Independence Day

    Independence Day: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 92. Heat index values as high as 100. Southwest wind 5 to 8 mph.

    High: 92 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. Southwest wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 50%.

    Low: 75 °F

    Partly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90.

    High: 90 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.

    High: 87 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 78. South wind 5 to 7 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Heat index values as high as 102. Light south wind becoming southeast 5 to 9 mph in the morning.
Friday Night
Partly cloudy, with a low around 77. South wind 5 to 8 mph becoming light and variable.
Independence Day
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 92. Heat index values as high as 100. Southwest wind 5 to 8 mph.
Saturday Night
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. Southwest wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 50%.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 73.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Monday Night
Mostly clear, with a low around 72.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Wednesday Night
Partly cloudy, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lambert-St. Louis International Airport MO
 38.76°N 90.37°W (Elev. 551 ft)
Last Update:
1:26 am CDT Jul 3, 2026
Forecast Valid:
1am CDT Jul 3, 2026-6pm CDT Jul 9, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation