FYI....
@ the Trevor J. Stockdale Memorial Coastal Monitoring Station (http://cmn.dl.stevens-tech.edu/ ) at Ocean Grove, NJ:
Water Temperature: 15.2oC (59.3oF)

And:
@ the Coastal Monitoring Network (http://cmn.dl.stevens-tech.edu/ ) at Avalon, NJ:
Water Temperature: 15.4oC (59.7oF)

Pretty close to 57 degrees in my book...

Sometimes these things are offline or the sensors are out of calibration, but it is a pretty good site...