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Extreme Heat Watch Issued for Portions of Delaware, New Jersey, and Pennsylvania

July 13, 2026 · wweather1 editorial · 2 min read

An Extreme Heat Watch has been issued by NWS Mount Holly NJ for parts of Delaware, New Jersey, and Pennsylvania. Dangerously hot conditions with heat index values up to 108 are possible.

An Extreme Heat Watch has been issued by the National Weather Service (NWS) Mount Holly NJ for several counties in Delaware, New Jersey, and Pennsylvania. The watch was issued on July 13 at 2:08 AM EDT and is set to expire on July 15 at 8:00 PM EDT. Dangerously hot conditions are anticipated from Wednesday morning through Wednesday evening.

The NWS forecasts heat index values possibly reaching up to 108 within the watch area. These conditions are considered dangerously hot.

Counties under the Extreme Heat Watch include New Castle County in Delaware. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties are affected. Pennsylvania counties include Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia.

The primary impact of these conditions is a significant increase in heat related illnesses due to the extreme heat and high humidity.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of fluids.
• Stay in an air-conditioned room.
• Do not leave young children and pets in unattended vehicles.
• Check up on relatives and neighbors.
📊 The numbers, from wweather1 data
Philadelphia: now +23°, Clear.
The record for this date is +36° (1966).
Three-day forecast: 14 July: +35°/+19° · 15 July: +39°/+22° · 16 July: +36°/+25°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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