I just returned from a 4-day cruise to Cozumel, out of Galveston. On Day 3 (at port), it did rain. I had contacted the owner of the deep sea fishing excursion boat we had chartered, and she said they go in rain or shine, unless the port is closed. So we went, and we did get rained on - even while I was snorkeling along the beach. It wasn't cold, but had we been more inland, I would have definitely wanted a rain poncho or light jacket.
On Day 4, at sea, the weather was cooler and mostly cloudy, and the seas were choppy. Most passengers stayed under cover although a significant number of peop