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Severe Thunderstorms With Heavy Rain over the Mid-Atlantic; Excessive Heat For Central/Southern U.S. to Mid-Atlantic

Severe thunderstorms are possible Sunday across the Mid-Atlantic region. Damaging winds, large hail, and flooding will be the primary threats with these storms. Meanwhile, dangerous heat will continue through Sunday across the central and southern U.S. into the Mid-Atlantic. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Thunderstorm and Windy

75°F

24°C

Humidity 79%
Wind Speed NW 29 G 40 mph
Barometer 29.86 in (1010.7 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 23 Jul 3:53 am CDT
Extended Forecast for

Herculaneum 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

  • Overnight

    Overnight: Occasional showers and thunderstorms.  Low around 78. West wind around 6 mph.  Chance of precipitation is 90%.

    T-storms

    Low: 78 °F

  • Sunday

    Sunday: Scattered showers and thunderstorms, mainly before 7am.  Cloudy, then gradually becoming mostly sunny, with a high near 96. Heat index values as high as 104. Northwest wind 3 to 5 mph.  Chance of precipitation is 30%.

    Scattered
    T-storms

    High: 96 °F

  • Sunday
    Night

    Sunday Night: A slight chance of showers and thunderstorms between 7pm and 11pm.  Mostly clear, with a low around 71. Northwest wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 20%.

    Slight Chance
    T-storms then
    Mostly Clear

    Low: 71 °F

  • Monday

    Monday: Sunny, with a high near 92. Calm wind becoming north around 5 mph in the afternoon.

    Sunny

    High: 92 °F

  • Monday
    Night

    Monday Night: Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm  in the evening.

    Mostly Clear

    Low: 68 °F

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    Sunny

    High: 93 °F

  • Tuesday
    Night

    Tuesday Night: Mostly clear, with a low around 72.

    Mostly Clear

    Low: 72 °F

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 97.

    Hot

    High: 97 °F

Detailed Forecast

Overnight
Occasional showers and thunderstorms. Low around 78. West wind around 6 mph. Chance of precipitation is 90%.
Sunday
Scattered showers and thunderstorms, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 96. Heat index values as high as 104. Northwest wind 3 to 5 mph. Chance of precipitation is 30%.
Sunday Night
A slight chance of showers and thunderstorms between 7pm and 11pm. Mostly clear, with a low around 71. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Monday
Sunny, with a high near 92. Calm wind becoming north around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
Mostly sunny and hot, with a high near 97.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 75.
Thursday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Friday
Mostly sunny, with a high near 88.
Friday Night
Partly cloudy, with a low around 66.
Saturday
Sunny, with a high near 88.
Click Map For Forecast
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
4:11 am CDT Jul 23, 2017
4am CDT Jul 23, 2017-6pm CDT Jul 29, 2017
 
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