Rain or shine, you will still have lots of opportunities to have a great time! On my last Alaska cruise, we had some rain most of the time, but it was a fantastic cruise. There are always more things that you can do on a cruise that time to do them all. As someone else mentioned, rain in the forecast doesn't mean it will rain all day either. The sea winds can bring quick changes in the weather and usually when the sky clears, it is gorgeous!