Any coastal town will have a lot more cloud cover than inland, especially compared to the San Fernando Valley. I lived in Pacific Palisades for many years, and June Gloom is a reality. In fact, one year we had coastal cloud cover all the way through August. You don't get the kind of humid heat in the summer that you have in Midwest, though.
If you want to live within 5 to 10 blocks of the ocean, you're going to pay for that, especially in Orange and San Diego counties. Also remember that most of Orange and San Diego coastline in very flat, so not much in the way of views unless you live right on the water. Ventura would be a better bet for views, and probably home prices, too.
You can always do what I did, and move halfway to the Conejo Valley (Thousand Oaks, Newbury Park) area. It's a whole different world here. Great weather (sunny almost all the time, but much lower temperatures than the valley), far less traffic, courteous people, very little crime, clean air, top rated schools, still close enough to do things in LA, and only a half hour to Channel Islands and Ventura Harbors.
Whatever area you consider, take your time and get to know the area before moving.