San Mateo is located in Silicon Valley, on the west side of the San Francisco Bay. San Mateo was incorporated in 1894. It has an estimated population of 103,536. San Mateo has a Mediterranean climate with warm, dry summers and mild, damp winters. It averages between 40-58F in the Winter and 56-82F in the Summer. San Mateo has one of the more prominent suburban downtowns in the San Francisco Bay Area.