The National Weather Service maintained a Severe Extreme Heat Warning for New York City until 9 PM EDT on July 4, 2026. The alert covered the Bronx, Kings (Brooklyn), New York (Manhattan), Northern Queens, Southern Queens, and Richmond (Staten Island), where dangerous afternoon conditions were expected.
Officials said the heat index could reach 105 to 110, increasing the risk of heat-related illness for people outdoors and those without air conditioning. Forecasters noted oppressive conditions during peak hours with limited early-evening relief. Last update: July 4, 2026
Heat warning timeline and affected boroughs
The warning remained in effect through 9 PM EDT, focusing on the city’s five boroughs and the divided zones of Northern and Southern Queens. The designation signaled that the combination of temperature and humidity would push apparent temperatures well above the air reading, sustaining a hazardous environment in dense neighborhoods and transit corridors.
Authorities advised residents in the Bronx, Brooklyn, Manhattan, Queens, and Staten Island to avoid prolonged exposure during mid to late afternoon. Public messaging emphasized planning activities to minimize time in direct sun and anticipating minimal cooling before nightfall in some locations, particularly where building heat retention is high.
Health risks and forecast heat indices
Health risks were elevated for older adults, young children, and people with chronic conditions as heat index values approached 105–110. High humidity reduces the body’s ability to cool through evaporation, driving faster onset of heat exhaustion and increasing the likelihood of heat stroke when exertion continues without adequate hydration.
Officials noted that overnight recovery could be limited in buildings without effective cooling, compounding dehydration and stress across consecutive hours of heat. The guidance underscored monitoring for symptoms such as dizziness, confusion, and cessation of sweating, and seeking immediate medical assistance in severe cases by calling 911.
Guidance for residents in New York City
Residents were urged to use air conditioning where available, drink ample water, and wear light, loose-fitting clothing. Authorities recommended shifting strenuous activity to early morning or later evening, checking on neighbors who are vulnerable, and never leaving children or pets in vehicles, where interior temperatures can rise to lethal levels rapidly.
People working outdoors were advised to take frequent breaks in shaded or air-conditioned areas and to move anyone showing signs of heat illness to a cool place promptly. Officials reiterated that those experiencing symptoms consistent with severe heat illness should call 911 for emergency assistance and seek medical evaluation without delay.
