I just got back from the Mercury to Alaska June 3rd.The weather was just wonderful.Sunny every port! As a matter of fact,above average temps.It was cold on the day of Hubbard Glacier cruising out on the deck,so wear your hat and gloves(and I had on my down jacket over my layers)
I did a glacier trek and it started out being a little cool and I was upset they made me leave my jacket behind and wear theres (I wanted both Im so cold natured),but soon into the 2 hr trek I began to warm up! It was really nice,but did indeed need my gloves/hat there.
If you take the WP train,it was very cold out on the platform.So take your layers,jacket,hat and gloves! And,if you want good shots,you have to go outside.If not,stay inside and its VERY warm with the stove,although each car has a choice to turn their stove off. We opted to keep ours on
In the dining room,I had on long sleeves and found it to be only slightly chilly.When we first went in each night it was warm and then cooler as the evening wore on.We had a wonderful table by the window so some warm natured men were complaining about the sun beating down on them!
..I loved it!