Sweltering conditions are gripping the New York City region this week, with a heat advisory extended for Nassau and western Suffolk counties as temperatures push close to 90 degrees and heat index values approach 95, according to the National Weather Service. The advisory, originally set to expire at 7 p.m. Sunday, was pushed back to 7 p.m. Monday as forecasters warned that hot, humid conditions would linger across the area.
The stretch of steamy weather comes after temperatures on Long Island neared 90 degrees on Sunday, part of what the National Weather Service described as several consecutive days of oppressive heat across the region. For anyone tracking weather NYC and the surrounding suburbs this week, the forecast points to more of the same through the first half of the week, with only a modest chance of relief from scattered showers.
Monday's forecast calls for sunny skies and a high near 88 degrees following an overnight low around 72, according to the National Weather Service. But the actual air temperature only tells part of the story. With humidity factored in, the heat index, or how hot it actually feels outside, is expected to climb to roughly 95 degrees.
James Tomasini, a meteorologist with the National Weather Service's Upton office, which covers New York City, Long Island and the surrounding region, said Monday would closely mirror the uncomfortable conditions seen over the weekend.
"Monday is also going to be a similar day," Tomasini told Newsday. "It will feel warm and humid outside... with some greater chances for showers and thunderstorms" arriving in the late afternoon and evening hours.
Health Precautions Urged as Heat Lingers
Tomasini stressed that the cumulative effect of the heat wave makes hydration especially important as the advisory stretches into a new week. "Stay hydrated, and if you're doing something active, take breaks in a shaded area if possible," he said. "It has been several days of this heat, so it's very important to stay hydrated."
The National Weather Service issued a broader set of safety recommendations for residents and workers across the region as the advisory remained in effect. People working outdoor job sites were urged to take breaks as frequently as possible to avoid heat-related illness. The agency also reminded residents never to leave children or pets unattended in vehicles, even briefly, as interior temperatures can spike to dangerous levels within minutes during heat advisories like this one.
Beyond those core warnings, the National Weather Service encouraged people spending time outdoors to drink beverages containing electrolytes to help protect against heat stress, reapply sunscreen every two hours, and wear lightweight, loose-fitting clothing to help the body regulate temperature more effectively. Combined, the guidance reflects standard heat-safety protocol the agency issues whenever advisories stretch across multiple days, as this one has.
Midweek Outlook Shows Little Change
Looking beyond Monday, the National Weather Service's forecast shows little relief from the heat through the middle of the week. Tuesday and Wednesday are both expected to bring high temperatures in the mid to upper 80s, with a mix of clouds and sunshine rather than the clear skies seen over the weekend. While that combination won't necessarily push heat index values as high as the mid-90s felt over the advisory period, the persistent warmth and humidity mean residents across the New York City metro area and Long Island should still expect uncomfortable conditions well into the workweek.
Rain chances remain limited during this stretch. The National Weather Service noted the possibility of showers late Monday, tied to the afternoon and evening thunderstorm risk Tomasini described, but the next more organized chance for wet weather isn't expected until early Thursday. At that point, the agency is forecasting a 30 percent chance of showers and thunderstorms, which could offer at least brief, localized relief from the heat and humidity that have dominated the pattern.
That modest rain chance is unlikely to break the heat entirely, and forecasters have not indicated that a significant cooldown is imminent. For now, the guidance from the National Weather Service's Upton office is focused squarely on managing the health risks of prolonged heat exposure rather than anticipating a near-term shift in the pattern.
The extension of the heat advisory specifically for Nassau and western Suffolk counties underscores how localized these warnings can be even within a single metro region. While the advisory covers those two Long Island counties directly, the broader hot and humid air mass responsible for the advisory affects the entire area served by the National Weather Service's Upton forecast office, which spans New York City, Long Island, and parts of the lower Hudson Valley. Residents outside the specific advisory zone may still experience similarly high heat index values, even without an official advisory covering their immediate location.
For now, the National Weather Service's message to the region remains consistent with what it has emphasized throughout the multi-day stretch of heat: limit strenuous outdoor activity during peak afternoon hours, stay hydrated, check on vulnerable neighbors and relatives, and treat cars as spaces where heat can become dangerous within minutes. With the advisory extended into Monday evening and similarly warm conditions expected Tuesday and Wednesday, forecasters are urging residents not to let their guard down simply because the calendar has turned the page on the weekend's initial burst of heat.
