Best day to go to the beach is when there is a light seabreeze. That helps bring the warmer water in and/or heats up from the sun. Even Maine can be warm relatively speaking on those days.
As a kid my friend had a pool...so many good memories. My folks have a cottage on Winni. It doesn't have to be 95/75...but a good summer day.
I used to hate the heat when I worked outside. But now with kids and all....I enjoy just hanging out when I can and they both love doing what I mentioned above. Yeah maybe I'll sweat mowing outside, but we take the A/C inside.
Because I like deep summer, pool, beach, lake etc. Love the warm nights being outside. Can't do anything other than hike Mt Monadnock or lay down pavement when it's 75/40.