Bahia San Agustin is a reef-focused bay where coral plates, walls, canyons, and underwater channels give divers a varied topography across a compact set of sites. Most entries are by boat, and the majority of sites are rated for beginners, though intermediate divers will find more demanding terrain at places like Whale Rock and La Rajada. The resident fish life is notably rich, with Acapulco Damselfish, Barberfish, Graybar Grunt, and King Angelfish observed consistently across the bay's reefs.
Monthly water temperature across Bahia San Agustin's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water stays warm throughout the year, with the coolest months in late winter still comfortable and temperatures peaking through mid-year and into autumn. The best-months data points toward late spring and November as particularly favoured periods. Most sites offer mild to moderate conditions, though intermediate sites such as La Rajada feature drift elements and stronger current exposure.
3 operators
2 more sites to explore
Water temperature around Bahia San Agustin ranges from about 27°C in February to 30°C in June, based on satellite sea-temperature data for its dive sites.
With water around 27–30°C, a rash guard or 3mm shorty works in Bahia San Agustin year-round.
Fin maps 12 sites in Bahia San Agustin (12 scuba diving sites and 3 snorkelling spots, with some suited to both).
Across Bahia San Agustin's dive sites, May and November are most often reported as the best months to visit.
The bay has an exceptionally consistent reef fish community. Acapulco Damselfish, Banded Wrasse, Barberfish, Chameleon Wrasse, and Graybar Grunt are all observed across virtually every site. King Angelfish and Threebanded Butterflyfish are also reliable sightings, and Guineafowl Puffer and Orangeside Triggerfish add variety to most dives.
The majority of sites are rated for beginners, including Carrizalillo, Jicaral, St. Agustine, and La India. Shore entry is available at Carrizalillo, making it a particularly accessible starting point. Intermediate divers can step up to Whale Rock and La Rajada, which offer canyon terrain, walls, and drift conditions.
Most sites require boat access, and three local operators, Valentina, Hurricane Divers S.A de C.V., and Huatulco Dive Center, run trips from the bay. Carrizalillo is the main exception, accessible directly from shore. St. Agustine can be reached by either boat or shore entry.
The bay offers real variety within a small area. Shallower sites like Carrizalillo and St. Agustine centre on large coral plates, while Las dos Hermanas and Chachacual West point feature reef and canyon combinations marked by distinct rock formations and underwater channels. Whale Rock adds an artificial reef element alongside its canyon terrain, and La Rajada presents wall and drift diving for those seeking more dynamic conditions.