Going to second abdmom's vote. I don't know of any heated pools in Hawaii. There probably are, but with the weather as mild and moderate as it is year round, I'm not sure why anybody would waste the $$ on heating a pool when the sun/weather will do that for you.
Its okay though, even if its cloudy and windy, you'll still feel warmer in the pool than out. I tested that theory many times growing up here.