We did the same itinerary last August, only southbound. Most days the weather was pretty cool and I was comfortable in a long sleeve shirt and windbreaker. There were a couple of days it was cooler and I put a sweatshirt on under the jacket. The day in Glacier Bay was cold, and I had a heavier coat on while sitting on the balcony. What you're packing sounds fine.
You can see my photos at http://www.kodakgallery.com/I.jsp?c=...&x=0&y=-t4z1wr
and see what I and others were wearing. No need to register, just click on View Slideshow.