We w went to Hawaii on Diamond Princess in March of this year, my daughter got married on the ship on our 2nd day at sea. The sea conditions and the weather were brilliant going out but coming back a little choppy on one day and the weather overcast. The weather around the hawaiin islands was beautiful and sunny all the time. It was a fantastic trip and well were doing. Hope you book it and enjoy it like we did.
The weather is always unpredictable but mainly around this area there's plenty of sunshine. However, if it rains, stay inside and tour the ship, but on all other occasions - sunbathe and have a great cruise.
We did this cruise last February and the weather was changeable but we able to sunbathe some days.
Really enjoyed this cruise and Princess line service have a great time,