Sept 2018 DIY Land tour from Fairbanks to Anchorage via Denali, SB Whittier to Vancouver. Some spits of rain in Fairbanks and Day 1 in Denali. Beautiful weather all the way through Ketchikan, including shorts weather in Juneau.. Rain on last sea day and disembarkation.
Aug/Sept. RT from Seattle 2022. Embarkation was beautiful, rained on sea days. Glacier Bay rain off and on. Hoonah was good weather, Juneau rain (got soaked whale watching), Ketchikan rain, rain on sea days back. Disembarkation was good weather.
Bottom line - both trips were awesome. Brink wet weather gear and mentally be prepared to do rain or shine and roll with it. Animals dont care.
PS Somewhere on this site I have a couple of reviews from my 2018 trip. Lots of pics.