I think we were there the last week before the cold front hit and it's too cold to swim in the Gulf. I am always hesitant to suggest that people swim in Galveston in October, but we were able to slip in a few days of swimming over the last weekend. Plus we were able to swim in our hotel's unheated swimming pool several times. We even got sunburned!
I really enjoyed watching the Harvest Moon Regata that began on Saturday. Several hundred sailboats-spinnakers, non-spinnakers, yachts, bi-hulls, tri-hulls, and every size boat you can imagine set sail from Galveston for Port Aransas. 150 miles of open sea for the winner. They were beautiful to behold on their way out. The beginning point of the race was the old Flagship Hotel.
We had our traditional seafood dinner at Bennos - blue crabs Cajun style for me, and blackened flounder for hubby. I've attached pictures.
Hope you have a great time if you're going...just don't expect to swim in the Gulf. It's getting very chilly.