We did a trip across the straight from French Creek launch to Thormanby Island last summer in a 17' Double Eagle. Plan was to trailer from Victoria early in the morning and launch at French Creek by 10am. Weather forecast looked good right up to the day before, then turned iffy, forecasting a wind warning for the afternoon. We got there at 11am and wind was already building, probably 10, gusting 15 knots or more. We decided to launch anyway and check it out. Within five minutes of leaving the protection of the breakwater at French Creek, we turned back. With a 45 minute crossing, and a building wind I anticipated the ride was going to be rough and wet. I did not want to scare the passengers, although actually my kids were having a blast pounding through the chop, spray flying. We had a cabin booked for the night on Thormanby, so a hard call, but we turned back and spent the night in a motel in Parksville, hoping for a weather window the next day.
Early next morning it was beautifully flat calm, and sunny and we had a beautiful crossing. So have a plan B depending on the weather. Make the call early, don't get half way across and realize you're in too deep.