I was there at the end of of July several years ago. Cape Cod is nice but the water on the ocean side was so cold I couldnt go any deeper than my knees. Makes New Jersey water feel like the Caribbean.
The water is never to cold for a white shark even our Februay water. But they migrate south for breeding of to follow the whales.
The water here in New England is too cold for most people and they don't spend a lot of time swimming in it. This of course helps reduce white shark attacks since whites seem to look there prey over before attacking. Thank goodness whites don't have the same attitude as a Bull shark has, or there would be many more shark attacks. -Tom
We used to go camping near he end of the cape every summer. I still remember the water temperatures written on chalk boards near the beach entrance - 55 degrees was pretty common. We were young and dumb and would stay in the water until our lips were blue (then stay in a bit longer.)