A 3/2 mm shorty will be more than sufficient.
I wore my 4/3mm wetsuit because in the beginning of the week it was only 22 degrees and I also wore it because of the long legs for protection against the corals, although I never stepped into any corals ...
No wetsuit could be a bit cold when the wind gets strong, but perhaps within 1 month the temperatures will rise over 35 degrees ? I don't know.
IS87 / IS101 / IS122 / US147