We were on the 12-27-03 Eastern, yes it was cool at the Port, but it was amazing how comfortable it was Sunday morning.
It was rough (waiters said it was the roughest it had been in a long time), and I've got great videotape of the family, all in shorts and T-shirts, in the gail force wind on the bow (or as far forward as you can get, in front of the wind-shield in front of the basketball courts), and my wife, who is always cold, was quite
comfortable.
It had rained overnight in St. Thomas, but had stopped by the time we docked.
And it rained in the afternoon at
Castaway Cay, which did sent a lot of folks scurrying back to the ship. But we were snorkeling, so we were wet already. It wasn't cold, but it wasn't hot either.
We were comfortable biking in our swimsuits, again dear wife wasn't cold, so I'd say you'll be okay.