The water temp doesnt actually vary much between summer and winter ... only by 1 deg or so ... only really warming up by the end of summer and cooling down by December.
As for the thickness of a wetsuit it depends on how much you are moving to keep warm and how long you are out for.
Its a personal choice between the thickness and warmth as the thicker wetsuits are a bit more restricting in movement.
You could get a slightly thinner one and add thin neoprene rash vests and shorts underneath.
If possible try/hire out a few until you are happy with the warmth.
Saves an expensive mistake!
I used a 7mm wetsuit when I used to surf.
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