Notice of NWS' New Version of Forecast
A new version of Forecast is coming soon!
Click here to visit the new site for details.

Severe Thunderstorms With Heavy Rain Possible In The Upper Midwest; Excessive Heat For Central U.S.

Several rounds of strong to severe thunderstorms will be possible from the northern Plains and upper Midwest to the Great Lakes through Friday. Damaging winds, large hail, and flooding will be the primary threats with these storms. Excessive heat will grip the central Plains with heat indices approaching 105 to 110 degrees. Very hot and humid conditions are likely to expand into the Mid Atlantic. Read More >

Current conditions at

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

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

102°F

39°C

Humidity 35%
Wind Speed W 9 mph
Barometer 29.94 in (1012.0 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index110°F (43°C)
Last update 21 Jul 2:51 pm CDT
Extended Forecast for

2 Miles ESE Saint Louis MO

Excessive Heat Warning until July 23, 08:00pm
Click here for hazard details and duration
Excessive Heat Warning
  •  
    Excessive Heat Warning until July 23, 08:00pm

    NOW until
    8:00pm Sun

    Excessive Heat Warning

  • This
    Afternoon

    This Afternoon: Isolated showers and thunderstorms.  Sunny and hot, with a high near 103. Heat index values as high as 113. South wind around 8 mph.  Chance of precipitation is 20%.

    Isolated
    T-storms

    High: 103 °F

  • Tonight

    Tonight: Isolated showers and thunderstorms before 8pm.  Mostly clear, with a low around 81. South wind around 7 mph.  Chance of precipitation is 20%.

    Isolated
    T-storms then
    Clear

    Low: 81 °F

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 4pm.  Sunny and hot, with a high near 105. Heat index values as high as 114. Southwest wind 7 to 11 mph.

    Sunny then
    Slight Chance
    T-storms

    High: 105 °F

  • Saturday
    Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 7pm.  Mostly cloudy, with a low around 78. West wind 3 to 8 mph.

    Chance
    T-storms

    Low: 78 °F

  • Sunday

    Sunday: Partly sunny and hot, with a high near 98. West wind 3 to 5 mph.

    Hot

    High: 98 °F

  • Sunday
    Night

    Sunday Night: Partly cloudy, with a low around 74.

    Partly Cloudy

    Low: 74 °F

  • Monday

    Monday: Mostly sunny, with a high near 92.

    Mostly Sunny

    High: 92 °F

  • Monday
    Night

    Monday Night: Partly cloudy, with a low around 71.

    Partly Cloudy

    Low: 71 °F

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Sunny and hot, with a high near 103. Heat index values as high as 113. South wind around 8 mph. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 81. South wind around 7 mph. Chance of precipitation is 20%.
Saturday
A 20 percent chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 105. Heat index values as high as 114. Southwest wind 7 to 11 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 7pm. Mostly cloudy, with a low around 78. West wind 3 to 8 mph.
Sunday
Partly sunny and hot, with a high near 98. West wind 3 to 5 mph.
Sunday Night
Partly cloudy, with a low around 74.
Monday
Mostly sunny, with a high near 92.
Monday Night
Partly cloudy, with a low around 71.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 97.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.
Click Map For Forecast
Point Forecast:
2 Miles ESE Saint Louis MO
 38.62°N 90.2°W (Elev. 446 ft)
3:42 pm CDT Jul 21, 2017
3pm CDT Jul 21, 2017-6pm CDT Jul 28, 2017
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database