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You will be unlucky if you get anything other than pleasantly warm to hot weather ...Neil Dow.
We have had 3/4 trips in the Med and all have been great the weather was mixed on some but the climate out there just now if fine. We did speak to two couples who did have a week of rough seas but that was in 1996 on a Thomson's ship which did not have all the equipment the larger ships have to ride out the odd stormy day but I am sure you will enjoy warm sunshine throughout.
We've cruised the Med many times in September and always had very warm/hot weather and calm sea.