I have been on the west coast most of my life.
I have been fishing offshoar here for many many years. I spent so much time on the water I contemplated getting my 6Pack License.
All that being said.. I would go in aug sept. It is when were having some very calm conditions most of the time.
If you wait till this time of year you may run into some real nasty weather.
These observations are only for the west coast out to about 50 miles.