New York, NY (June 9, 2026)

Residents across New York City, Long Island, Westchester, and several northern New Jersey counties are being urged to prepare for a sharp rise in heat and humidity Thursday, with conditions expected to feel dangerously hot during the afternoon and evening hours.

A Heat Advisory is scheduled to take effect from noon until 8 p.m. Thursday for the five boroughs, Westchester County, much of Long Island, and parts of northern New Jersey, including Passaic, Hudson, Union, Essex, and Bergen counties. Forecasters expect the combination of high temperatures and humidity to push heat index values toward 100 degrees in portions of the region.

The advisory comes as a surge of warm, humid air moves into the area, bringing some of the hottest conditions of the season so far. While the advisory currently covers Thursday, forecasters are monitoring whether the heat may persist into Friday. Some uncertainty remains depending on whether cooler air moves in from the east.

Health officials and emergency agencies are reminding residents to take precautions, particularly during the hottest part of the day. Older adults, young children, people with chronic medical conditions, and those with mental health concerns are considered especially vulnerable during periods of high heat.

Residents are encouraged to drink plenty of water, limit strenuous outdoor activity, check on neighbors and relatives, and spend time in air-conditioned spaces when possible. Homes without air conditioning can quickly become hotter than outdoor temperatures, especially in apartments or buildings with poor ventilation.

Anyone who must be outside Thursday should take frequent breaks, wear lightweight clothing, and watch for signs of heat-related illness, including dizziness, nausea, heavy sweating, confusion, or weakness. Pets should also be kept indoors or in shaded areas with access to water.

The heat is expected to ease somewhat after the late-week stretch, though temperatures may remain above normal heading into the weekend.

Heat advisory issued for NYC, Long Island and Hudson Valley as heat index nears 100: https://t.co/dJNAIdah7z

: Maria Birnell / The Journal News/lohud.com pic.twitter.com/LZM8JjufFF

— lohud.com (@lohud) June 10, 2026

Hot and humid conditions will combine to produce maximum heat index values approaching 100 degrees Thursday and Friday.
Isolated to scattered strong to severe thunderstorms possible in the afternoon and evening today through Friday.
Full Briefing: https://t.co/LpL4h0XYMs pic.twitter.com/TXpU6sF7gk

— NWS New York NY (@NWSNewYorkNY) June 10, 2026

It’s about to get hot, New York.

Sometimes, too hot.

Don’t let extreme heat sneak up on you this summer. Go to https://t.co/B0DWoVpTzh for more information on how to stay cool during heat emergencies. pic.twitter.com/2sWx3WXfGl

— Mayor Zohran Kwame Mamdani (@NYCMayor) June 10, 2026