Check out the Pacific Cup (San Francisco to Oahu
race) website: Consider the Possibilities | Pacific Cup
. They have good info on the conditions to expect and preparation advice.
I can't tell you about the situation near San Diego, since I have sailed (twice) directly from San Francisco
, and was well offshore
by the time I got that far south. I do understand that the wind can be quite light for the first couple of hundred miles.
I agree, June and July are good. August too, but the chance of hurricanes/depressions is a little worse then. In June the summer offshore weather
pattern may not have established itself, so the Pacific High may be well to the south of its late-July position. This is more of an issue for a San Francisco
departure, but take a look at the 2007 Transpac race
data: 2007 TRANSPACIFIC YACHT RACE Los Angeles to Honolulu Homepage
(the Transpac leaves from Long Beach), where many boats got caught in the southeast ridge of the Pacific High and added many days to what is usually a two-week or less trip.
You might be interested in my boat's website and blog, where I have daily reports from my 2003 cruise
(and back), and my 2006 Pacific Cup race
back to San Francisco). In 2006 we got caught in the southeast Pacific High ridge and had a slow time of it.
As for ship traffic, don't expect to see much once you get away from port. In 2003 we didn't see one ship after the second day. In 2006 I think we saw three. I've seen more ships sailing back over the top of the High to San Francisco, but still not a lot.
What are your plans when you get to Hawaii?