Hot and muggy would seem to make for uncomfortable sleeping on the hook, without AC.
We've been to the BVIs in Nov. and SO always grumbles about the heat at night, so I'd be concerned that it would be pretty HOT without an AC in June. I'd probably be OK with it (I am much more heat tolerant), but he would not be.
If you charter
a nice pricey boat with AC, and you plan on docking
at a marina with shore power
each night, that would be cool and comfy. But we love to anchor
out. So I don't foresee us doing a summertime charter
for that reason.