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!
The best and fastest way to compare local temperatures for the coast, inland areas, mountains and desert, is to check out (and bookmark) any of the weather pages on the San Diego network web sites. They give highs and lows, so checking periodically will give you a great idea.
Cory La Scala
As it sounds like you already know, the temperatures throughout San Diego County can vary widely.
If you go to my website, http://www.GreaterGoodRealty.com and click on the "Lifestyle" tab along the top, you can search each neighborhood and view the average weather temperatures by month, average rainfall, and much more.
It also give you school district information, demographics, average income, and more.
Hope this helps.
By the way, I am the co-founder of Greater Good Realty. In addition to providing valuable information about the San Diego real estate market, my company donates 10% of our commissions to local charities and non-profit organizations throughout San Diego.
We hope to make a difference for those in our neighborhoods!
Greater Good Realty