The National Weather Service maintained a Severe Extreme Heat Warning for portions of southern Connecticut, northeast New Jersey, and southeast New York until 9 PM EDT on July 4, 2026. A separate warning that covered parts of central New York and northeast Pennsylvania was active until 8 PM EDT on July 3, 2026.
The updates matter because dangerously hot conditions can rapidly lead to heat-related illnesses, especially for people working or exercising outdoors and those without air conditioning. Heat index values reaching up to 105 in the New York metro area and even higher readings earlier in central counties increase health risks and strain on local services.
Areas under warning through July 4
Through the evening of July 4, the warning remained in effect for Southern Fairfield and Southern New Haven in Connecticut; Western Passaic, Eastern Passaic, Hudson, Western Bergen, Eastern Bergen, Western Essex, Eastern Essex, Western Union, Eastern Union in New Jersey; and Southern Westchester in New York. Forecasters indicated heat index values up to 105 meaning the combination of temperature and humidity could feel significantly hotter than the air temperature alone.
Authorities urged residents in these counties to expect oppressive afternoon conditions and to plan for limited relief during the early evening. People sensitive to heat, including older adults, young children, and those with chronic conditions, face the greatest risk during this period of extreme heat.
Earlier advisory window in central New York and northeast Pennsylvania
The earlier warning for central New York and northeast Pennsylvania, which ended at 8:00 PM EDT on July 3, covered Northern Oneida, Yates, Seneca, Southern Cayuga, Onondaga, Steuben, Schuyler, Chemung, Tompkins, Madison, Southern Oneida, Cortland, Chenango, Otsego, Tioga, Broome, Delaware, Sullivan and adjacent counties across the state line including Bradford, Susquehanna, Northern Wayne, Wyoming, Lackawanna, Luzerne, Pike and Southern Wayne. Maximum heat index values in that area were expected to reach between 100 and 110 during the period, with continued readings between 95 and 105 later in the cycle.
Nighttime temperatures in those locations remained very warm, limiting cooling in non–air-conditioned spaces and compounding health risks. The combination of high daytime heat and poor overnight recovery can rapidly worsen dehydration and heat stress.
Safety guidance and health risks
Officials advised residents to use air conditioning where available, check on vulnerable neighbors, wear light and loose-fitting clothing, and drink plenty of water. They emphasized avoiding leaving children or pets in vehicles, where interiors can reach lethal temperatures quickly, and recommended limiting strenuous activity to early morning or evening hours.
Anyone experiencing symptoms consistent with heat stroke or severe heat illness should call 911 immediately. Last update: July 4, 2026.
