Lived in CA from 1972 to 2006. San Francisco is nice in October. In the months of May and June, near the coast and a bit inland, you will encounter May gray and June gloom. Inland valleys will have sunshine. The weather can be warm during the summer, but near the coast, quite nice. The coastal highway is beautiful and in some spots, a bit twisty, but the views are spectacular. August and September seem to be the warmest month around the Los Angeles basin and you can still have some warm days into October...but do remember, it's much less humid than other parts of the US.
Personally, I always liked May and June even with the cloud cover where we lived....in San Diego county about 13 miles inland.
No matter when you go, you'll enjoy.
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Namaste y'all
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