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If I could ask, what are the better times of year to visit the CA coastline? I'm planning on doing a similar trip myself in mid-July and would probably re-schedule if my timing won't yield good conditions for photography.
In Southern California, the marine layer is persistent starting from about mid-May all the way to the end of June. From the beginning of July on, it's typically sunny most of the day. However, even in the middle of the summer, we can have cloudy days, so there are no guarantees.