We just returned on a 7 day Inside Passage on Discovery Princess.
When the sun came out, and that was fairly rare, it felt warm and short sleeves was adequate. However, most of the time the weather was overcast, with periods of rain, and at night, on the ship, it was fairly cool. Going outdoors did require a sweater.
Of course, indoors, where the majority of the passengers spent most of the time. was no problem.
My wife and son tested positive for Covid after we returned home.
Fortunately, symptoms were mild and both had an excellent response to Paxlovid.