I just came back from swimming on the course and water temp is approx 65. I swam with nothing on my feet, hands and head no problems infact it was refreshing. So if you are dining Welland this weekend see you there. Starting to get nervous this is my first HIM.
It's a great course for a first half IM. the swim is pretty calm and relaxed, easy to site. bike is flat and fast (only one real hill in the entire 90 km. Run leaves a little to be desired, but there are long sections of it that are shaded.
Good luck! I hope the thunderstorms stay away for you!