It really depends on where you go. That time of year can also be variable in terms of Viz at any location. Head up to Pt. Hardy and you are more likely to get better Viz and some amazing diving. Nanaimo and Victoria have some great wreck diving. Are you looking for shore dives or boat dives? Feel free to drop me a line when you are looking to finalize plans and I can give you some direction. I have about a thousand dives logged around the island
Dan