Re: Barkley Sound, West Coast Vancouver Island
We just did that trip at the end of June. 31 foot full keeled sailboat.
We really had to consider the currents in the straight as we only motor around 5 knots and they can easily run 2-3 knots in places, more in the Race Rocks area.
The winds generally build in the afternoon from the west, so we made early starts, which also worked with the currents at the time.
Victoria to Port Renfrew was about 10 hours, Port Renfrew to Ucuelet was about another 10 hours motoring, winds were light for us and we made port before they picked up.
Port Renfrew is a nice midway stopping point but there is not much there and the anchorage is fairly open and can be rolly if the swell is coming in. Holding is good.
On the return trip we had light winds from the SE.....so much for the fun downhill run home.
It is beautiful there as you know and Bamfield, Ucuelet and Tofino are lovely places to spend some time. And it should still be nice in September, just keep in mind you will have less daylight for the longer legs.
Hopefully you will also hear from others with more experience.