* WHAT...Dangerously hot conditions with heat index values up to 108 degrees possible during the daytime hours. * WHERE...In New Jersey, Morris, Sussex, Warren, and Hunterdon Counties. In Pennsylvania, Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...From Wednesday afternoon through Saturday evening. The hottest conditions are forecast to occur Thursday through Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Very warm low temperatures in the low to mid 70s at night will not offer any relief from the heat. This combined with multiple days of near record breaking temperatures will exacerbate the impacts from the heat and humidity.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
AI Weather Forecast · Sunday, June 28, 2026
7 AM – 6 PM
Patchy fog before 9am, then a slight chance of showers and thunderstorms. Partly sunny. High near 82, with temperatures falling to around 80 in the afternoon. Northeast wind 0 to 3 mph. Chance of precipitation is 20%.
6 PM – 6 AM
Patchy fog after midnight. Partly cloudy. Low around 63, with temperatures rising to around 65 overnight. Southeast wind 0 to 3 mph.