Did a cruise last November. In the Carribean for 4 days (as we had come through the Panama Canal). In Aruba it was bl**dy hot (40C in the sun, about 35C in the shade). The sun bleached my green hat in a day (so make sure you wear one, or your head will go the same way!). Better on board as you get a bit of a breeze, but you should have no probs with temperature. If this is your first time, you won't be disappointed; ours was a brilliant holiday.