San Jose, California, located in the heart of Silicon Valley, enjoys a Mediterranean climate with warm, dry summers and mild, wet winters. Summers are typically sunny and warm, with temperatures averaging around 80°F (27°C). Winters are mild and rainy, with temperatures around 60°F (15°C). The city experiences over 300 days of sunshine annually.

San Jose's hydrology is influenced by the nearby Santa Clara Valley, which is home to several rivers and creeks. The Guadalupe River flows through the city, providing a natural habitat for various bird species and offering opportunities for kayaking and fishing. San Jose also boasts several reservoirs, including Almaden, Calero, and Chesbro, which provide water storage and recreational activities such as boating, fishing, and hiking.

The city offers numerous outdoor recreation opportunities. The Alum Rock Park provides hiking trails, picnic areas, and scenic views in the foothills of the Diablo Range. The Santa Clara County Parks system maintains several open spaces and regional parks in the area, including the popular Almaden Quicksilver County Park, offering miles of trails for hiking, biking, and horseback riding. With its mild climate and natural beauty, San Jose provides residents and visitors with ample opportunities to enjoy outdoor activities year-round.