San Diego, located on the southern coast of California, boasts a pleasant Mediterranean climate with mild, dry summers and warm winters. The city enjoys around 266 sunny days per year, making it an ideal destination for outdoor activities throughout the year. Summers are typically warm and arid, with average temperatures ranging from the mid-70s to low 80s Fahrenheit, while winter temperatures remain mild, ranging from the mid-60s to low 70s Fahrenheit.

Hydrologically, San Diego receives most of its water supply from imported sources, such as the Colorado River and the Sacramento-San Joaquin River Delta. The city also relies on local reservoirs and groundwater. The region's beautiful coastline offers various water-based recreational opportunities, including surfing, swimming, sailing, and kayaking. Mission Bay Park, one of the largest man-made aquatic parks in the United States, provides ample opportunities for boating, jet-skiing, and paddleboarding.

Apart from water activities, San Diego offers several other outdoor recreation options. Hiking enthusiasts can explore the scenic trails of Torrey Pines State Natural Reserve and Cowles Mountain. Balboa Park, with its numerous gardens, museums, and open spaces, provides opportunities for picnicking, biking, and leisurely walking. With its exceptional climate and diverse landscapes, San Diego caters to a wide range of outdoor interests.