During my 5 days in coz last month my computer read 79-80 the whole time. I was comfortable in a 3mm full suit with hooded vest doing 3-4 dives per day. Others on the boat seemed fine with 3mm shorties ans skins until the day we had a mini-Norte. It was very windy and overcast and the people in shorties looked uncomfortably cold getting back on the boat.
I was there a couple of Januaries ago, and IME the more neoprene you have covering your body when you get out of the water and a cool wind is blowing and the humidity is low, the colder you will be. Get that rubber off you and a dry towel on you ASAP.