San Diego is wonderful! I love everything abou it. However, as you go further south in Baha, the climate becomes unbearably hot and the terraine difficult and it is void of life. I went motorcycling there in the 80's for three days and it was hell. But returning to San Diego was like entering heaven.
Have to tell you it's all what you are used to. Last summer I brought a youngman (policeman) to Eastern Washington state for 3 weeks - everyday here in July - he couldn't believe how hot it was - he went back home and told them it was hotter in WA than 150 miles south of Ensenada on the baja. Much of that area while dry gets the same coastal breezes
that SanDiego enjoys. I was just there 13 days (baja) 6 miles from the ocean and the hottest day was about 85, but it has been in the low 90's in other years. If you go inland a little more and higher it does get hotter than a pistol!! for sure!