snow, thunderstorms, 90~100 degree weather, more rain, thunderstorms again, more hot weather, hail, hot weather, thunderstorms. Wind of varying degrees throughout. Portland just isn't quite sure what to do around June~early August. Most of August is usually consistently hot, though.
I will say though that snow in Summer is relatively rare and can only think of it happening 4 times in my life. Hail's much more common.