We've cruised in Alaska in May and September, and never took down stuff. We just dressed in layers, which we could remove. Had nice weather both times. Had rain one day on each cruise. An inexpensive poncho might be in order. The only place it was really cold was in Glacier Bay..............we wore ALL of our layers there. We had ski caps and gloves, and wore them on deck that day. A windbreaker and sweatshirt were the most we needed any day in port. Hope you have weather as nice. Have a great cruise. If you take your down jackets, consider one of those space bags to pack them in..........takes up much less space.