Val, even leaving the PNW in July/August requires serious foulies until you cross south of the California border... Unfortunately you won't need them all the way and that's a lot of gear for just a (hopefully) short part of your trip.
But if it turns out you do need it, you'll be thankful to have it.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)