I went on a March cruise last year and the weather was great. It rained for about an hour on Castaway Cay but the sun came out right after that and everyone just went back to having fun. I wouldn't worry about the weather, rain usually doesn't last long in the bahamas.
We went on the 3 day wonder in early March and the weather was fabulous. We took alot of capri pants etc, but should have took shorts. It was plenty hot for the beach and swimming!! Our trip was hot and sunny the entire time!
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