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

75°F

24°C

Humidity 66%
Wind Speed S 10 mph
Barometer 30.03 in (1015.5 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 20 Jun 6:51 am CDT
Extended Forecast for

Greendale MO

Extreme Heat Watch June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • Today

    Today: Mostly sunny, with a high near 94. South wind 6 to 10 mph.

    High: 94 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 77. South wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 98. Heat index values as high as 106. South wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 78. South wind 7 to 10 mph.

    Low: 78 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 97. South wind 6 to 10 mph.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 95.

    High: 95 °F

    Slight Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 94. South wind 6 to 10 mph.
Tonight
Mostly clear, with a low around 77. South wind 9 to 11 mph, with gusts as high as 20 mph.
Saturday
Sunny and hot, with a high near 98. Heat index values as high as 106. South wind 10 to 14 mph, with gusts as high as 23 mph.
Saturday Night
Mostly clear, with a low around 78. South wind 7 to 10 mph.
Sunday
Sunny and hot, with a high near 97. South wind 6 to 10 mph.
Sunday Night
Mostly clear, with a low around 78.
Monday
Sunny and hot, with a high near 97.
Monday Night
Partly cloudy, with a low around 77.
Tuesday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 95.
Tuesday Night
Partly cloudy, with a low around 76.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Wednesday Night
Partly cloudy, with a low around 76.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Greendale MO
 38.69°N 90.31°W (Elev. 594 ft)
Last Update:
5:37 am CDT Jun 20, 2025
Forecast Valid:
7am CDT Jun 20, 2025-6pm CDT Jun 26, 2025
 
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