On July 7, 2015, NWS implemented changes to the icons depicted on all of its point-forecast pages. Changes include new icon images with increased clarity, 6-hour increments for rapidly changing weather and new color blocks to highlight forecast hazards.

A page depicting all of the new icon images can be accessed here: www.weather.gov/forecast-icons

Changes to the icons were based on analysis of 6,700 public comments collected in 2014. Also, many of these changes are based on the results of a research project led by the National Center for Atmospheric Research.

Users are encouraged to continue to provide comments regarding these changes via email at icons@noaa.gov. NWS will continue to analyze incoming feedback and refine the icons as necessary. Any substantial change to the icons will be facilitated through the NWS public comment/review process.

Heat Wave in Central U.S.

Dangerous heat will continue in the Nation's mid-section on Tuesday. Combined with high humidity, this will lead to Heat Index temperatures ranging from 100 to 110 degrees Fahrenheit across parts of the Plains and mid-South. Heat Advisories and Excessive Heat Warnings are in effect. If you must be outside, slow down and drink plenty of water.
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Current conditions at

St. Louis, Lambert-St. Louis International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

78°F

26°C

Humidity 76%
Wind Speed Calm
Barometer 29.94 in (1012.4 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 28 Jul 2:51 am CDT
Extended Forecast for

Saint Louis MO

Excessive Heat Warning until Tuesday 09:00pm
Click here for hazard details and duration
Excessive Heat Warning
  •  
    Excessive Heat Warning until Tuesday 09:00pm

    NOW until
    9:00pm Tue

    Excessive Heat Warning

  • Overnight

    Overnight: Mostly cloudy, with a low around 76. Calm wind.

    Mostly Cloudy

    Low: 76 °F

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 96. Heat index values as high as 110. Calm wind.

    Mostly Sunny
    then Slight
    Chance
    T-storms

    High: 96 °F

  • Tuesday
    Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 82. Light and variable wind.

    Partly Cloudy
    then Slight
    Chance
    T-storms

    Low: 82 °F

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 91. Heat index values as high as 101. Light west wind becoming northwest 5 to 9 mph in the morning.

    Chance
    T-storms

    High: 91 °F

  • Wednesday
    Night

    Wednesday Night: Partly cloudy, with a low around 67. Northwest wind 3 to 7 mph.

    Partly Cloudy

    Low: 67 °F

  • Thursday

    Thursday: Sunny, with a high near 87.

    Sunny

    High: 87 °F

  • Thursday
    Night

    Thursday Night: Mostly clear, with a low around 71.

    Mostly Clear

    Low: 71 °F

  • Friday

    Friday: Sunny, with a high near 89.

    Sunny

    High: 89 °F

Detailed Forecast

Overnight
Mostly cloudy, with a low around 76. Calm wind.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Heat index values as high as 110. Calm wind.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 82. Light and variable wind.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 101. Light west wind becoming northwest 5 to 9 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 67. Northwest wind 3 to 7 mph.
Thursday
Sunny, with a high near 87.
Thursday Night
Mostly clear, with a low around 71.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 69.
Saturday
Sunny, with a high near 88.
Saturday Night
Mostly clear, with a low around 69.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
Partly cloudy, with a low around 72.
Monday
Mostly sunny, with a high near 90.
  Click Map For Forecast
Point Forecast:
Saint Louis MO
 38.62°N 90.23°W (Elev. 489 ft)
3:10 am CDT Jul 28, 2015
3am CDT Jul 28, 2015-6pm CDT Aug 3, 2015
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Graph

National Digital Forecast Database