Hermine is expected to begin weakening as it churns hundreds of miles offshore in the Atlantic Ocean.
But forecasters are warning it could continue to impact areas from New York to southern New England with pounding waves, coastal flooding and beach erosion before it moves out to sea.
A tropical storm warning remains in effect Tuesday from Long Island to Massachusetts.
New York officials have extended beach closures beyond Labor Day because of dangerous rip currents.
In New Jersey, large waves and churning surf up to the base of dunes were reported in some areas of the state that were hit hard by Superstorm Sandy in October 2012, but no flooding or other damage was reported.