Summer is the nicest day of the year in the PNW.
I was in Squamish over the weekend and found dry rock in the 5.8-5.14 range, most of the routes were hard 5.11s or easy 5.12s. There was a tall, high quality 5.10 that stayed dry until the wind picked up a bit. This was in a steady drizzle on Saturday and it was the only dry rock I saw on Sunday. You should be able to find info in the Squamish guide book.