Normal
Well its a possibility you may find yourself rocking on any cruise. Oct maybe a bit more of a possibility. If your leaving from Vancouver its less of a possibility than Seattle which has way more "Outside travel" but ship happens anytime of the year anywhere. Been on several "late" cruises out of both places and have never had rough water on them But I have experienced one or two early or mid season patches of rough water where it affected others. Nothing that bothered me personally. Oddly enough its those odd shapped water of the atlantic and the caribbean that get my head buzzing a bit. I think the ships wobble over there compared to bucking in the Pacific.