I went in december-- and its nice , humidity is down a little --- maybe a little cooler on deck at night -- but dfeinitely summer weather for northeners. THe only change i made to my packing for summer cruises was the clothes i wore from home to the airport
We did western carib last late Jan and the weather was awful the entire week. I think we had unusally bad luck though, according to what the crew said about the weather the previous week. If you are going to Cayman, I have heard that often you cannot tender into port if the seas are rough, although for us this was actually the best weather we had the entire week....Cayman was GREAT! Don't miss Stingray City. It was very cold and windy in Cozumel, temp in the 40-50's.