As a general rule, the farther inland you travel, the warmer the temps are. There's also less variation in temperatures at the coast than there is inland, i.e. there's more difference between daytime highs and overnight lows in the mountains and deserts than at the beach.
San Diego's weather is complicated by our many "microclimates," or small areas that have distinctive weather patterns different from the region at large. For example, my neighborhood is pretty far inland however it's located close to a river valley so we get cooling coastal breezes even in the summer.
When you're ready to make a move, a good Realtor with local knowledge can give you more info about the climate in your preferred neighborhood. Good luck!... more