Sorry I should have said consistant spring action but I appreciate your input regardless
It depends on the year, and depends on what you want. Mid June can be really good for teen size Chinook (the odd bigger ones) , but a little early for coho action. You also get a lot of time on the water if you are self guiding as the days are long that close to the summer solstice, and it's early enough you also will probably avoid the pinks. Early season usually has more bad weather days, but you can almost always find a sheltered place to fish no matter where the weather is coming from. Later on in July and early August the Chinook numbers may not be as high, but there are more big ones, and the Coho show up as well.
Langara is pretty easy to Fish if you can cut a decent cut plug, you can get guided one day if you want, but the guides are probably going to just take you to Coho, McPherson, Boulder or Lacy depending on the wind and tides and drag around cut plugs on the wire. If the fishing is tough there are other spots they will go, and they will catch fish when you maybe won't, but if the fish are there, there will usually be good bites at the 4 main spots. The guides also make the run to some spots on the West side of Graham Island if its tough at Langara, but they don't want the smaller self guided boats heading to those in case it gets foggy or rough.
You can read the archived reports on the lodge websites too to get a better idea of what and when. West Coast fishing Club and Langara have their reports on their website, do a bit of research reading those for the last few seasons. Its a beautiful area, enjoy the trip, we all need more friends like that that that will take us to premium lodges!