...Highlights: whale sharks, hammerhead sharks, shark action, dolphins, manta rays, schooling fish & big pelagics...
...Diving environment: advanced divers, off the beaten track...
Situated in the Golden Triangle, 342 miles (550 km) off the mainland of Costa Rica, the converging nutrient-rich currents from nearby deep water attract multitudes of pelagic action to Cocos. Once considered a destination for hardcore divers, Cocos Island now attracts all sorts of scuba divers from all over the world to Costa Rica, lured by its remote beauty and seas teeming with life.
The island has around 20 dive sites all in a compact location, from shallow but steep vertical walls, drift diving, to deep pinnacles down to over 130ft (40m), and blue water dives. All sites are close to the island and one another, making Cocos an ideal liveaboard diver's playground. Show more
Bajo Alcyone - is unparalleled as the place to see hammerhead sharks. After a quick descent to the seamount top at 82ft (25m), find a crevice to wedge into and the hammerheads will gently glide into the picture until they fill your entire field of vision! From viewing their distinct hammerhead silhouettes at the surface to watching them descend below you, you will be spoilt for choice with photo ops. Show more
The only way to get to the island is aboard one of the comfortable and professional Costa Rican liveaboard dive boats that operate in the area from the Pacific town of Puntarenas. For more information on the cruises and all the other travel information you might need to visit Costa Rica and the island, visit our Cocos liveaboard section.
Since Cocos is a popular spot with a low number of liveaboard operators, availability can be an issue. We recommend you book 12 months in advance to avoid disappointment.
Depending on conditions at sea, the boat trip from the Costa Rican mainland usually takes about 36 hours cruise time. So you will have more than enough time to get to know your fellow passengers and prepare your equipment as well as catch up on any R&R you may need before the fun diving at Cocos begins. This makes for a unique situation where the tourists are almost exclusively divers.
The island is situated near the Equator where 2 weather patterns converge, which results in changeable weather, relatively cool equatorial air temperatures averaging 78°F (25.5°C), and average annual precipitation of over 23ft (7m). Rainfall alternates with sunny skies all year round. This however, does not affect the scuba action.
If you prefer calmer seas and higher visibility then book your trip between December and May - the dry season. Dry season typically sees calmer seas and visibility of over 89 ft (30m). In fact, for many, the best time to dive at Cocos Island is in the 'rainy' season from June through December, when the nutrient upswells attract manta rays and whale sharks. The surface is rougher during this period and visibility drops to within the range of 33 to 82ft (10 - 25m). Plankton rather than rainfall is more likely to be the factor that reduces visibility. The long open ocean crossing is likely to be less comfortable during this time. The rainy season is also said to attract the most hammerhead sharks as well, although they are seen in huge numbers during most of the year.
Water temperatures hover between 75 and 86°F (24-30°C) (average 82°F 27.8°C) and there is a seasonal variation of only a few degrees. However, temperatures can vary dramatically, dropping up to 43°F (6°C) due to thermoclines. This can be an arresting sensation if you are inadequately suited. We recommend a 5 mm full length wet suit, hood, gloves and boots to be prepared for all eventualities.
So it is all a matter of preference when is the 'best' time of year for a visit to scuba dive this Costa Rican island. August and September are the 2 most popular months. June and July are said to hold the promise of both calm seas and a good chance to see the big creatures.
There are fewer Cocos liveaboard trips during January through early June. In this period, some liveaboards alternate their cruises between Cocos Island and Caño Island.
Review our maps below of Cocos Island, its host country Costa Rica, and their location in the world. Here, you will find information on how to get to Cocos.
Depth: 33 - >130ft (10 - >40m)
Visibility: 40 - 98ft (12 - 30m)
Currents: Moderate to very strong
Surface conditions: Can be rough and choppy further from shore
Water temperature: 75 - 86°F (24 - 30°C)
Experience level: Advanced, mandatory surface marker buoy
Number of dive sites: ~20
Distance: 342 miles (550 km) west of Costa Rica
Recommended length of stay: 10 days
Operator websites: Deep Blue Diving