Located in Duval County, Texas, San Diego offers a unique blend of diverse outdoor recreational opportunities, a pleasant climate, and an abundance of hydrological constituents. The city experiences a semi-arid climate with hot summers and mild winters. Summers are typically hot and dry, with temperatures often exceeding 100°F, while winters are mild and relatively dry, with temperatures rarely dropping below freezing.

San Diego benefits from its proximity to the San Diego Creek, which provides a source of water and supports various hydrological constituents. The creek is a popular spot for fishing and boating, with large populations of bass, catfish, and other freshwater fish species. Additionally, the creek's surrounding areas offer picturesque hiking trails, providing opportunities for nature enthusiasts to explore the region's diverse flora and fauna.

Outdoor recreation opportunities in San Diego extend beyond the creek. The nearby Choke Canyon State Park offers camping, hiking, and wildlife viewing opportunities, including the chance to spot deer, wild turkey, and various bird species. Furthermore, the Lake Corpus Christi State Park, just a short drive away, provides opportunities for boating, swimming, and picnicking.

In summary, San Diego, Texas, boasts a pleasant semi-arid climate, a variety of hydrological constituents, and numerous outdoor recreational opportunities, making it an appealing destination for nature lovers and outdoor enthusiasts alike.