Just getting this out of the way, stereotypical northwest weather is NOT as bad as most think it. Pretty mild weather through most of the year, as Portland and most areas south of it are nice and tucked in between mountain ranges.
Summers are nice, usually 80-85 degrees, ocasional stretches of 90 or so. No rain in summer, whatsoever. Usually starts around May and lasts into September, so we have about 5 months of great weather.
Fall sees a pretty big dip in the temperature. Not very much rain, still, but some. Usually sticks around 30 degrees, and does that for the rest of winter. We barely get any snow, though. I've lived her for over a decade now, and I recall having maybe four years where it snowed. Winter is just cold and rainy for the most part, sticking around 30-35 degrees.
The transition into spring is usually marked by a pretty sharp spike in temperature. One day you're freezing your rear end off, the next you're starting to wear shorts and flip flops. Usually comes in March, and the rain starts fluctuating. The temp gradually rises from 70's through March and April, and it starts raining less frequently until it becomes summer.
So yeah... Oregon rules in the summer. Beautiful weather all of the time from May through August at least. Great for sports as well... I have snowboarded and body surfed in the same day before. It was pretty nice.