The city has pinpointed neighborhoods where its toughest to live during hot weather.
And figures from the Department of Health show the Bronx is particularly bad.
Neighborhoods at the highest risk of death or illness because of heat include Belmont, East Tremont, Fordham, University Heights, Highbridge, Concourse, Hunts Point, Longwood, Morrisania, Crotona, Mott Haven and Melrose.
That's 12 areas in total.
Brooklyn also has its share of neighborhoods high on the Heat Vulnerability Index, with Bedford-Stuyvesant, Brownsville, Bushwick, Crown Heights, Prospects Heights, and East Flatbush on the city's watchlist.
Central Harlem is also considered a dangerous location in the heat, while Staten Island appears to be the safest borough overall.
The city says higher surface temperatures and lack of green space factor into its data.