Trust me, I'm not complaining about the nice warm summer water temps. But it is sometimes difficult to underwear-dress right this time of year.
The dive Monday was 80 mins, max depth 200'. Most of the dive was spent in water in the 60's and 70's, but I dressed for the 49 degrees we believed it would be at depth (turned out to be 51). I was comfortable at 200', but actually hot for the deco - which was the majority of the dive. Also it was sunny and hot on the surface, so out of the water was a sweat-fest.
That's the thing about summer. Big temperature swings (40's at depth to 90's on the surface.) It's why I like fall diving the best. The water is still (relatively) warm but there is less swing from surface to depth.