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

81°F

27°C

Humidity 82%
Wind Speed S 12 mph
Barometer 29.96 in (1012.9 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 30 Jun 12:51 am CDT
Extended Forecast for

Greendale MO

Extreme Heat Warning June 30, 01:06am until July 3, 10:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 30, 01:06am until July 3, 10:00pm

    NOW until 10:00pm Fri

    Extreme Heat Warning

  • Overnight

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98. Heat index values as high as 106. Southwest wind 6 to 9 mph.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 78. Southwest wind 5 to 8 mph.

    Low: 78 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind 5 to 8 mph.

    High: 98 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 79. South wind 5 to 8 mph.

    Low: 79 °F

    Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98.

    High: 98 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 78.

    Low: 78 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 97.

    High: 97 °F

    Sunny then
    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 77. Southwest wind 6 to 8 mph.
Tuesday
Sunny and hot, with a high near 98. Heat index values as high as 106. Southwest wind 6 to 9 mph.
Tuesday Night
Clear, with a low around 78. Southwest wind 5 to 8 mph.
Wednesday
Sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind 5 to 8 mph.
Wednesday Night
Clear, with a low around 79. South wind 5 to 8 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98.
Thursday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 78.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 97.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Independence Day
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 96.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Sunday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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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:
12:11 am CDT Jun 30, 2026
Forecast Valid:
1am CDT Jun 30, 2026-6pm CDT Jul 6, 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