San diego summer temps can be brutal. They should definitely stress but u probably won't lose anything. I grew inland last year with really high summer temps and I was fine. Now that I'm near the beach it should be much better. Your temps should be similar in the valley.
Daniel
I guess I'm not as worried about the days as I am the nights. I looked at average summer nighttime temps for San Diego and they were between 65 and 68 degrees, which isn't ideal but may be tolerable.
What's your experience been?