We were in Panama April 11th and the temperature was already 98 degrees. It was miserable with the high humidity. That is one reason the cruise lines do NOT book cruises during the hot summer months for Panama.
The balance of the Caribbean is VERY tolerable during the summer months--Hot-- Just as southern Florida, southern Texas is HOT during the summer. Many if not most of the vehicles are air-conditioned, all business are air-conditioned, and the water temperature is PERFECT for water sports.... Most cruisers complain about how COLD the ship is and to be sure and take a light jacket..
Most cruisers would LOVE to live in the Caribbean year around, as there is not that much of a temperature swing between the winter or summer months.
Have FUN in the beautiful Caribbean with the other 2 million plus tourist ~~!!~~ :lol