According to the National Weather Service, nearly 4-and-a-half inches of rain made it the wettest day since 2014.
Nearly 2 inches of rain fell from 10 p.m. to 11 p.m., the wettest hour on record in New York City.
What was supposed to be a fun and long night for people attending "We Love NYC: The Homecoming Concert," ended sooner than expected after lightning struck during Barry Manilow's performance.
The event's organizers were forced to end the concert, sending more than 22,000 people who danced and partied on the Great Lawn home early.
Overnight, flash flooding forced the Brooklyn-Queens Expressway to briefly close when water got too high for cars to pass through.
There was also street flooding in Queens. Video showed the problem along Beach 84th Street in the Rockaways.
New York City beaches are closed Sunday and Monday and the Five Boro Bike Tour was rescheduled for Aug. 29.
The MTA has banned trucks with empty trailers from bridges and tunnels. Metro-North's entire New Haven Line and the Wassaic Branch of the Harlem Line are suspended.
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