San Carlos Bay offers a varied diving landscape built around shallow reefs, pinnacles, walls, and a pair of deliberately sunk wrecks that serve as artificial reefs. The Suchiate Wreck and ARM Santos draw beginners, while Eagle Rock and Seamount provide more engaging topography for intermediate divers. Nudibranch diversity is a real draw, with the Mexican Dancer, Felimare Agassizii, and Felimare californiensis encountered across most sites. The California Sea Lion and Round Stingray round out the regular cast. Most access is by boat, with a handful of shore-entry options.
Monthly water temperature across San Carlos Bay's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures follow a clear seasonal curve, warming through late spring and peaking in summer and early autumn, then cooling considerably through winter. The warmest months align closely with the best-diving histogram, making summer and early autumn the most popular period. Cooler winter conditions are still diveable but call for more thermal protection.
5 operators
12 more sites to explore
Water temperature around San Carlos Bay ranges from about 18°C in February to 29°C in August, based on satellite sea-temperature data for its dive sites.
In the warm season (about 29°C) a rash guard or 3mm shorty is comfortable in San Carlos Bay; in the coldest months (about 18°C) step up to a 5mm suit.
Fin maps 24 sites in San Carlos Bay (21 scuba diving sites and 3 snorkelling spots, with some suited to both).
Across San Carlos Bay's dive sites, July and August are most often reported as the best months to visit.
The bay has a rich cast of regularly observed species. Round Stingray and Stone Scorpionfish are seen across virtually every site, while the Mexican Dancer nudibranch and Felimare Agassizii appear with very high frequency. King Angelfish, Finescale Triggerfish, Porcupinefish, and Panama Graysby are common reef residents. California Sea Lion encounters are a highlight at many sites.
The majority of sites in San Carlos Bay are rated for beginner divers, including several shallow reefs and the two wreck sites, Suchiate Wreck and ARM Santos. Shore entry is possible at Frenchie's Beach and Window Rock, which eases the learning curve. Intermediate sites like Eagle Rock and Seamount are also accessible by boat for those ready to progress.
The overwhelming majority of sites are boat-access only, and several local operators including Dive San Carlos by Paragon Dive Group, El Mar Diving Center, and Mexico Travel Adventure run regular trips. Shore entry is available at Frenchie's Beach and Window Rock for those who prefer self-guided diving close to shore.
Natural reefs form the backbone of the diving, ranging from very shallow structures to deeper pinnacles and walls. The bay also features two artificial wreck reefs, the Suchiate Wreck and the ARM Santos, both deliberately sunk to encourage marine life colonisation. Eagle Rock adds a pinnacle-and-wall combination for divers seeking more dramatic topography.