I'd think you'd probably be ok temperature wise all year round. I've been to fiji in mid june and no need for a wetsuit. How ever I think from a safety point of view it might be a good idea. More for protection against the sun and possibly any stingers taht might pay you a visit. Like rxcnc2 said, a 2mm or even 1.5mm with out a hood would be good. I'd leave your wetsuit at home and if the need arises just get one over there, or sent over from the states or europe? PM Jimdoe2you, as he has great prices as well as gives DB members a discount on his net prices. Check out
The Spearfishing Store