Extreme Heat Watch Issued for Portions of Delaware, New Jersey, and Pennsylvania
The NWS Mount Holly NJ has issued an Extreme Heat Watch for portions of northern Delaware, central and southern New Jersey, and southeast Pennsylvania. Dangerously hot conditions, with heat index values up to 110 degrees, are possible from Wednesday afternoon, July 1, 2026, through Saturday evening, July 4, 2026.
An Extreme Heat Watch is in effect for portions of northern Delaware, central and southern New Jersey, and southeast Pennsylvania. The specific areas include New Castle, Mercer, Salem, Gloucester, Camden, Northwestern Burlington, Delaware, Philadelphia, Eastern Chester, Eastern Montgomery, and Lower Bucks. Residents in these regions should anticipate dangerously hot conditions with heat index values potentially reaching 110 degrees during daytime hours.
The watch was issued on June 29 at 2:46 AM EDT and is set to remain in effect until July 4 at 8:00 PM EDT. The period of concern for the extreme heat spans from Wednesday afternoon, July 1, 2026, through Saturday evening, July 4, 2026.
Heat-related illnesses are expected to increase significantly during this event due to the combination of extreme heat and high humidity. Compounding the daytime heat, very warm low temperatures, ranging from the mid 70s to low 80s at night, will offer no relief. This continuous heat, alongside multiple days of near record-breaking temperatures, will exacerbate the impacts from the heat and humidity.