We've been to Alaska twice, most recently in 2005 on the Coral Princess and did the land tour, including a visit to a sled dog kennel. In all ports and in Denali, Talkeetna and Fairbanks, it was very cool. We went in August. I wore a short sleeved shirt at the Princess lodge one day and the rest of the time I had on a light jacket over a long sleeved shirt and jeans with hiking boots or walking shorts. That outfit worked well everywhere. When we were in Glacier Bay, at the Mendenhall Glacier and College Fjord, we had on heavy jackets, gloves, wool hats and were still cold. You need all that to stand out on the deck and view the Glaciers, but it is so worth it! We just visited the sled dogs and did not ride a sled but it was great to see and hold the puppies and you still needed a jacket and jeans. The best bet for Alaska is to have layers and be prepared with a jacket and small umbrella at all times.