New York is bracing for a sweltering heatwave, with temperatures expected to soar and feel significantly hotter than desert cities like Phoenix due to intense humidity.
The eastern United States is the latest region to face extreme heat as the planet grapples with rising temperatures. In the coming days, New York City could see mercury readings near 100 degrees Fahrenheit (38 degrees Celsius). However, the oppressive humidity will make it feel closer to a blistering 109 degrees Fahrenheit (43 degrees Celsius).
Cities from Detroit to Washington, D.C., and Boston are also forecast to experience temperatures around 20 degrees Fahrenheit above normal as the holiday weekend approaches. While Phoenix might see higher dry-heat temperatures, New York's combination of heat and humidity will create a uniquely uncomfortable and potentially dangerous environment.
This intense heat poses serious health risks. High humidity significantly hampers the body's ability to cool itself through sweating, as the air is already saturated with moisture, making sweat evaporation less effective. "When there’s high humidity, especially in a heat wave, it’s much more difficult for the body to physiologically cool off," explains Richard Allan, a climate scientist at the University of Reading.
The National Weather Service has issued heat warnings and watches across a wide area. Beyond the scorching daytime highs, overnight temperatures are expected to offer little relief, increasing the risk of heat stress. New York City Mayor Zohran Mamdani is urging residents to develop heat plans, emphasizing access to air conditioning and checking on vulnerable neighbors.
This extreme heat blast follows a week of record-breaking temperatures in Europe. Scientists attribute the increasing intensity and frequency of heatwaves to the burning of fossil fuels, which amplifies global warming. "The warming from rising greenhouse gases is clearly adding to global temperature, and that adds extra heat to the heat waves," Allan notes. The current heatwave may also be influenced by El Niño, a natural climate phenomenon expected to strengthen throughout the summer, suggesting more intense heat events could be on the horizon.
