The fishing can be hit and miss. It certainly not what it used to be, but I have talked to people who still go up and get 20 fish days occasionally (at least thats the story they are telling). But the peak is in August.
Do you have a package set up? I was up there on a charter and this particular day nobody was catching anything, except this one boat. So my guide and I were talking and he points out this boat and says "thats famous grouse, (SP?)he is allways catching fish". I was pretty surprized that he would make that remark since next time I get up that way, I know who I am fishing with.
In June all your going to see is Chinook. The Coho & Pink runs wont move in until August. You may have some interesting regs to follow at that time. They had a special size restriction in effect in the past because its Puget Sound Chinook that are passing through durring that time and they worked out and agreement to minimize catch of the wild fish.
You will probably be fishing the lighthouse area off the south tip of Quadra island. In this area and the entire west passage of the island had extreme tidal movement. You will really be fishing near the bottom alot except for on the tide change because the fish need to sit on the bottom to get out of the current.
If its great fishing or not you will probably have a good time. Lots of marine life, cruise ships going by almost daily. There is just alot to see. If you get a chance, check out Seymore narrows when the tide is runing. Lots of feeding eagles there for the fish that get churned up in the current.