Nah, it's nicer than that. Usually it's "summer" by early May, sometimes sooner. Then the rain stops in July, not to return until the end of September/October. Summer drought ensures Cascade conifer forests boy howdy. Coast Range too. But you know the weather, El nino all that crap. It's been nuts the past couple years.
Look thru our old camping threads for pix, they tell the tale. Yeah lots of raincoats!

But 1000 year old forests? I'll take a little rain. Waterfall factory. Lots of cool old history out there too, Indian relics.