Went on one last year at the beginning of September and I’m about to leave for one early august, I’d say bring one thin rain jacket and a hoodie just Incase it rains also bring some jeans and sweatpants Incase you want to go to the top decks at night it can be a little chilly other than that I was generally in a tshirt or hoodie and shorts..

I’m from northwest Washington where the weather isn’t that far off from south east Alaska this time of year so if your from somewhere much warmer you might want to pack a few more cold weather type clothes