Coney Island was packed with Brooklyn residents soaking up the sun before temperatures hit dangerous levels across New York later this week.

With an extreme heat advisory in effect starting on Wednesday, city and state officials remind New Yorkers to seek air-conditioned environments, avoid being outside too long, and to stay hydrated. This is especially for those who are most vulnerable, like seniors, babies, those with health conditions and people who work outside.

Extreme heat is the leading cause of weather-related deaths in the U.S. Doctors remind everyone to watch out for symptoms of heat stroke, including:

Hundreds of cooling centers will be activated across New York City starting on Wednesday to offer a cool place to anyone without air conditioning at home.