With temperatures well into the 90s expected, city officials are urging New Yorkers to get ready for another hot week.
A heat advisory is in effect until 6 p.m. Wednesday.
Cooling centers will be open through Thursday.
Officials are advising older and sick New Yorkers to try and find places with air conditioning, and urge people to check on elderly neighbors.
Also, New Yorkers should make sure to drink lots of water and avoid strenuous activity.
City pools and beaches are open. Most pools are open daily through 7 p.m. and beach lifeguards are on duty through 6 p.m.
Those who want to open a fire hydrant should be sure to have an FDNY-approved spray cap. People over 18 years old can get one at a local firehouse.
At the Muhlenberg Library in Chelsea, which also serves as a cooling center, New Yorkers enjoyed the air conditioning on Monday.
"It's like an oasis in the middle of the desert. We're blessed to have places like this," said one New Yorker.
"I get a lot out of this cooling center. Sometimes I meet people and I read very interesting things," said another.
To find a nearby cooling center, call 311 or visit nyc.gov/oem.