The city is under a Heat Advisory through Saturday night amid “extreme heat” that may be dangerous to some New Yorkers, officials said Friday. 

Temperatures in the five boroughs climbed above 90 degrees on Friday, and are forecasted to do the same on Saturday. 

The National Weather Service said the heat advisory is expected to last until 8 p.m. on Saturday. 

“Extreme heat like this can be dangerous,” Deputy Mayor for Public Safety Phil Banks said at a news briefing.

New York City residents “really need to make sure that they are doing everything they can to prepare,” New York City Emergency Management Commissioner Zach Iscol added.

Iscol encouraged New Yorkers to stay indoors with air conditioning and set their thermostats to 78 degrees to conserve energy and prevent blackouts and “brownouts” around the city. 

Mayor Eric Adams on Thursday said 500 cooling centers have opened across the five boroughs. New Yorkers can find their nearest cooling center by calling 311 or clicking here.

An Air Quality Alert has also been issued for the city until 11 p.m. on Friday, according to the National Weather Service. 

“We have an [Air Quality Index] of 108, which is unhealthy for sensitive groups, so that’s children, older adults, people with respiratory and heart conditions, due to ozone, not due to wildfires,” Iscol said.

All New York City Department of Parks and Recreation intermediate and Olympic-sized outdoor pools will be open an extra hour Friday and Saturday. The city said the pools will stay open until 8 p.m. instead of 7 p.m.

Officials are also anticipating potential storms on Saturday afternoon, Iscol said.