We were at VBR the first week of November last year. DS lived in the pool, he and DH also went into the ocean. Brrr...too cool for my blood though. For me it was absolutely perfect weather to lay in the sun and read a book, mid to upper -70's with a light breeze. At night it got a touch cool, you would need a light sweater, but not a coat or anything. That was a couple weeks earlier than you are going, but it should be pretty close to the same.
Anne