We went last Sept. 8, & a jogging suit w/sweatshirt & turtleneck underneath was warm enough while at the glacier. But don't forget the gloves & hat; I had to run back to cabin & get mine. Is was too cold without it. It was COLD at the glacier!! We only had sprinkles the day we were at Skagway, altho is was raining when we cruised out of Vancouver.