We took Carnival Spirit out of Vancouver to Whittier with similar stops the last week of August this year. Like Greyson, a little rain on one stop, great the rest of the time. Probably in the mid 50's most days. We had many sunny days with great visibility. Long sleeved turtleneck with a denim jacket was all I needed most of the time. I'll also recommend the whale watching and other shore excursions - it's so beautiful, you'll love it!