I was there from the 4th to the 12th and also saw water temps about 84 degrees at all times. Never used more than my skin, although there were people on the boat using 5-7 mm and hoods (?). The diving was VERY relaxing ( I ended up with 12/13 dives over 70 minutes)
Did about half the dives on Klein and enjoyed it but don't think it is worth going back for awhile. Much of the coral in the shallower areas was in bad shape, and there was lots of debris ( Tires and 55 gal drums) in the shallows.
Tried beach diving once but the entries were quite difficult and just not for me.
Stayed at Carib Inn and the dive masters were fine and let everyone dive there own profiles, but the boats were primitive and doing only 2 boat dives/day was wasteful.
Many great restaurants on the island, but with the big cruise ships starting to come in, the infrastructure will have to get better.
The one thing of note was that most, if not all, of the divers I met were over 50 and were considerate, friendly and knew how to handle themselves on a crowded boat.
As soon as I get my pictures in shape, I will post some.
Looking forward to me January trip to 'Statia and Saba with a bunch of friends.
Thanks to everyone for the input.
Donn