Hot by your standards maybe and also has been hotter in recent years but generally speaking most people find Southern California to have the best climate in the US and also in the world.
Also, remember that at least some of the people in socal are there because they wanted to socal climate, so there's some selection bias.
I lived in San Diego too, and thought it was too hot there, and also very hostile to cycling (a big deal to me). The climate mattered for that too since I was always sweaty when I got where I was going.
But I'm glad you like it!
West coast of the US in general feels nicer to most people I've met. What is more temperate than socal? Maybe Cape Town and Nairobi, but it would be tough for me to come up with many places.