The rain rumor is to keep the Californians out
Though really, rain in Washington/Oregon isn't that bad it's the grey skies on the West/Wet side of the State. I live in Eastern WA - a lot more sun. So depends on what part of WA you are moving to. Either way there are a lot of areas to ride.
2011 JKU Sahara; Sahara Tan, Leather, 3.73, Auto, Hard/Soft Top, SpiderWebShade, Dead Pedal, Skid Row Foot Pegs, BFG KO2, 10a Wheels