Hello fellow San Diegan!
I find my sleep varies by if we are having a coastal fog morning or not. I get up earlier if the sun is out and sleep in a bit later if it's still overcast.
There's not really any particular number that thou shalt have. I find I do best somewhere between 8 and 9 hours without much variation by season. Also, I think people who live where there is a dramatic change in climate with the seasons might have a more dramatic difference between their summer and winter sleep patterns.