A: Typically, San Jose has a Mediterranean climate with dry warm summers and mild winters. Because it is inland, expect more sunshine and less fog than the surrounding san Francisco Bay areas. Temperatures can vary from 42°F to 82°F throughout the year. Summers get warm, but nights still stay on the cooler side, with breezes off the Bay, so pack a sweater or jacket. In the late fall or winter, pack a warm coat and gloves.