Ocean Beach is a beach on the west coast of San Francisco, California, United States, bordering the Pacific Ocean. It is adjacent to Golden Gate Park, the Richmond District, and the Sunset District. The Great Highway runs alongside the beach, and the Cliff House and the site of the former Sutro Baths sit at the northern end. The beach is a part of the Golden Gate National Recreation Area, which is administered by the National Park Service.
During the late spring and summer, San Francisco's characteristic foggy weather frequently envelops the beach. The average temperature for the last 5 years has been 13.2 °C (55.8 °F) Most of the beach-friendly weather occurs in the fall (usually mid to late September) and early in the spring when fog and strong sea breezes are less prevalent. Dry winter days also tend to provide excellent weather at Ocean Beach (especially in drought years).
The water at Ocean Beach is noteworthy for its strong, dangerous currents and powerful waves, which make it popular among serious surfers. The water is cold, due in part to a process known as upwelling, in which frigid water from below the ocean surface rises to replace the surface water that moves away from the beach as a result of the Coriolis effect. The rapid rip currents, cold water, and threat of sneaker waves make the ocean dangerous for casual swimmers and even those who simply want to set foot in it, especially those with no wetsuits and no lifejackets, because swimmers and even waders have been swept away and drowned. The southern portion of the beach by Sloat Boulevard has some of the cleanest water in the state.