Are you sure you are not on the Aurora on Cruise R 315 3rd Sept, as the Arcadia is in the Mediterannean at that time. Just looked it up on P&O website. This cruise does not visit the Hawaiian Islands.
Think Cox may be correct and it is Aurora that is doing the USA and Canada in Sept 2013.We are also on this cruise and have done it a few times. I would not get to excited about the weather you could get anything a couple of years ago it was quite wet in NY and Rhode Island Spring like in Boston and Quebec. I would pack for all eventualities. but a raincoat and a warm jacket may be useful.
The Arcadia is doing this cruise in Sept/Oct 2014. The questioner needs to know about the weather!
Unless the ship is calling into the Hawaiian islands en-route, are they expecting the right weather predictions, because even at this early stage even Mystic Meg would not know.
Where did the Hawaiian islands come into it. It would be a long cruise Southampton,USA,Canada and Hawaiian Islands.
Under Subject P&O Cruises Hawaii Cruises Weather.