Keep clear of the Hurricane season, from June to the end of November. Weather down here, and in the Bahamas is hot and sticky and the water feels like a warm bath. I live in south Florida and we prefer to cruise in the wintertime. I'm used to warm ocean water and the last time we went to Castaway Cay (during November a couple years ago), I was wearing a lightweight short sleeved wetsuit to snorkel and a beanie to keep my head warm and I would suppose the water temperature was about 78 or so. My son and son-in-law were with me, and we swam for way over an hour, visiting all the markers in the snorkeling area. Those of us who live down here become WWW's (warm water weenies). I rode the Aqua Duck with my one grandson, and the water in it was about 66 degrees. Going down the first little hill, the water came up and slapped me in the middle of the back, and I had a muscle spasm that hurt for the rest of the cruise. See? WWW!!!