San Martin is a part of Santa Clara County in California. Its name comes from Marin Murphy who was the first one to build a Catholic church in this area. San Martin is considered a census-designated place (CDP) and has been thinking about incorporating into a town or city for several years. The climate in San Martin is on the tropical side with temperatures ranging from 34 degrees F in the winter and 90 degrees F in the summer. There has been no snow in this area for over 20 years and it is rare that they would even get it at all.