Check out the very small community of Punta Banda 12 miles south of Ensenada (70 miles south of San Diego). Punta Banda has a gorgeous, peaceful 6 mile long beach where you can rent homes right on the beach which is not over ran by tourists. The entire beach is used mostly by full time residents and renters of the beach homes. Punta Banda has gorgeous weather. During the summer it will be 10-15 degrees cooler than downtown Ensenada because there is always a cool breeze off the water. Not hot and humid at all. This is casual beach living--not an all inclusive beach resort area. Any beach community south of Ensenada either on Baja or the Mainland will be hot, hot, humid, humid all summer. Good luck.
Agreed, Ensenada or cities around it. Air will be breezy but still warm. But the water is cold year round. I highly recommend San Felipe in Baja. Very hot in July and August but perfect in May. :-) but Manzanillo is the best if you want something like Hawaii. I have been to all the cities I mentioned, all very safe. happy travels and blessings from Mexico!