We've been the past two Decembers, both times from the 15-25th. Last year, the weather was beautiful; high 70's or low 80's. We swam every day, wore shorts every day, never needed pants or a jacket. We spent a lot of time at the pool. The year before, we still swam every day, but it was not quite as nice; I wore capri's rather than shorts, and we wore sweatshirts or light jackets at night. This year, I'm bringing swimsuits again and hoping for 80's.