North America · Mexico
Revillagigedo (Socorro)
Habituated giant oceanic manta rays circle divers at open-water cleaning stations.
Photo: Elias Levy · CC BY 2.0
The Revillagigedo Islands are a cluster of volcanic seamounts roughly 250 nautical miles south of Cabo San Lucas, reachable only by multi-day liveaboard. Giant oceanic manta rays here are famously habituated to divers, circling for minutes at open-water cleaning stations, while schooling hammerheads and passing dolphin pods patrol the blue water off San Benedicto and Socorro Island. Humpback whales migrate through and are sometimes heard, or seen, between January and March.
About diving in Revillagigedo (Socorro)
Everything here runs on the boat's clock. Trips sail from the Baja cape, cross open ocean for the better part of a day and a night, then settle into several dives a day around the same handful of sites for the rest of the week. There is no shore option, no day-boat alternative and no changing your mind mid-trip: you dive what the swell allows, inside a national park that requires permits and a check-in with the naval detachment on Socorro. Briefings happen on deck between meals, and the last day is the crossing home.
The islands are bare volcanic rock with essentially no coral reef. Dives work lava ridges, boulder slopes and pinnacles that fall away into open ocean, so most of the interest sits off the structure rather than on it. Sites differ mainly in how much water is moving. Some are gentle enough to drift a ledge and watch; the exposed rocks put divers in surge at the top and current on the corners, with up- and downdrafts around the edges that need constant attention.
Entries are usually negative, off a skiff, straight down into blue water, with live-boat pickups afterwards, so an SMB and the discipline to stay as a group are standard. The mantas are the giant oceanic species, the largest of them several metres across, and the encounters run on the animals' terms: they hold station above a group and come back for exhaled bubbles. Touching them is prohibited and guides enforce it. Shark diving is a matter of holding position on a corner and watching passing traffic rather than pursuing it.
This is a trip for divers who already have open-water, current-exposed dives logged; boats commonly ask for a minimum logged count, and nitrox is close to standard. It is not the place to build early experience, and it offers little for macro photographers. Late June to October is hurricane season, so itineraries run from November to mid-June, with the humpback window falling in the middle of that stretch rather than at either end. Park fees are usually charged on top of the fare.
Best time to dive Revillagigedo (Socorro)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Prime | Prime | Prime | Good | Good | Fair | Off-season | Off-season | Off-season | Off-season | Fair | Good |
| Sea surface | 25°C77°F | 25°C77°F | 25°C77°F | 25°C77°F | 25°C77°F | 25°C77°F | 27°C81°F | 29°C84°F | 28°C82°F | 28°C82°F | 28°C82°F | 27°C81°F |
| Daytime high | 25°C77°F | 24°C75°F | 24°C75°F | 25°C77°F | 25°C77°F | 27°C81°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 28°C82°F | 27°C81°F |
| Rain | 34 mm1.3 in | 17 mm0.7 in | 5 mm0.2 in | 6 mm0.2 in | 4 mm0.2 in | 29 mm1.1 in | 58 mm2.3 in | 119 mm4.7 in | 122 mm4.8 in | 62 mm2.4 in | 36 mm1.4 in | 51 mm2.0 in |
| Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|
| Prime | Prime | Prime | Good | Good | Fair |
| Sea surface | |||||
| 25°C77°F | 25°C77°F | 25°C77°F | 25°C77°F | 25°C77°F | 25°C77°F |
| Daytime high | |||||
| 25°C77°F | 24°C75°F | 24°C75°F | 25°C77°F | 25°C77°F | 27°C81°F |
| Rain | |||||
| 34 mm1.3 in | 17 mm0.7 in | 5 mm0.2 in | 6 mm0.2 in | 4 mm0.2 in | 29 mm1.1 in |
| Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|
| Off-season | Off-season | Off-season | Off-season | Fair | Good |
| Sea surface | |||||
| 27°C81°F | 29°C84°F | 28°C82°F | 28°C82°F | 28°C82°F | 27°C81°F |
| Daytime high | |||||
| 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 28°C82°F | 27°C81°F |
| Rain | |||||
| 58 mm2.3 in | 119 mm4.7 in | 122 mm4.8 in | 62 mm2.4 in | 36 mm1.4 in | 51 mm2.0 in |
2011–2025 averages. Sea surface: NOAA Coral Reef Watch, measured at the surface, so deeper water can run colder. Daytime high and rain: NASA POWER.
November: the season opens with the water at its warmest, around 28 °C, and whale sharks are most often seen in November and December. December: still warm, with giant mantas at the cleaning stations, as they are from the first trip of the season to the last. January to March: the prime stretch, because humpback whales arrive from late January to early April to breed and calve and are often heard underwater; the water drops to its coldest, around 21 °C in February. April and May: seas are usually calmer and the water warms again, and schooling hammerheads, silky sharks and tuna are most often seen in May and June. Early June: the last trips of the season, in water around 25 °C. Late June to October: no boats sail, because this is hurricane season.
Best months: January, February, March
Socorro Island water temperature and weather by month
The sea surface runs from 25 °C (77 °F) in March to 29 °C (84 °F) in August. Most rain falls from July to October, peaking at about 120 mm (4.7 in) in September; it stays largely dry from February to May. Daytime highs reach 29 °C (84 °F) in August and drop to 24 °C (75 °F) in March. Below the surface the water can drop to about 21 °C (70 °F), so pack a 5 mm suit.
Dive types & marine life
Giant oceanic mantas are the constant across the November to mid-June season. Humpbacks pass through from late January to early April and are often audible underwater. Hammerhead schools and jack shoals work the pinnacles throughout, dolphins turn up at some sites and stay to interact, and whale sharks are an occasional sighting rather than a reliable one.
- Pelagic & blue water
- Seamount
- Drift
- Manta rays
- Hammerheads
- Whale sharks
- Whales
- Dolphins
- Trevally & jacks
Best dive sites in Revillagigedo (Socorro)
- 1
El Boiler
San Benedicto pinnacle topping out at 6 to 7 m; giant mantas queue at its cleaning station.
- 2
Roca Partida
Lone rock spire in open ocean, walls past 40 m; hammerheads, oceanic whitetips, tuna and mantas.
- 3
Cabo Pearce
Socorro east-coast point running into the current; long dolphin encounters and hammerheads.
- 4
The Canyon
South side of San Benedicto; hammerhead, silky and Galapagos sharks, gentler than El Boiler.
- 5
Roca O'Neal
Socorro west coast, known as Hammerhead Central; a 10 to 12 m plateau with a cavern.
- 6
Punta Tosca
Socorro west coast, where dolphins, humpbacks and tiger sharks turn up.
Site guides
Giant Pacific mantas cleaned by Clarion angelfish on a shallow pinnacle
A rock small enough to swim around, sharks on every side
How to get to Revillagigedo (Socorro)
Liveaboard only, generally sailing from Cabo San Lucas, with the better part of a day and a night at sea each way. Fly in the day before at the earliest, because once the boat has left there is no way to join or leave a trip, and the islands themselves have no visitor facilities.
Photos from Revillagigedo (Socorro)
Alberto Alcalá · CC BY 4.0
Talia Cohen · CC0
Alberto Alcalá · CC BY 4.0
Alberto Alcalá · CC BY 4.0
Dive videos
THE PELAGIC KINGDOM OF SOCORRO︱REVILLAGIGEDO ISLANDS︱MEXICO ︱BEST PACIFIC SCUBA DIVING︱4K HDR VIDEO · MOKEN PLANET on YouTube
4K Underwater Video: Revillagigedo Archipelago (Socorro Islands) Scuba Diving · Undersea Productions on YouTube
Questions divers ask
What certification do I need to dive Socorro?+
Advanced Open Water is the usual minimum, and boats commonly ask for around 50 logged dives with recent experience in current and deep water. Entries are into open ocean with no bottom in sight, so a large surface marker buoy and a personal locator beacon are standard kit.
When is the best time to dive Socorro Island?+
January to March is the prime stretch, because humpback whales pass through from late January to early April while the mantas are present all season. Whale sharks are likelier in November and December, and hammerhead schools in May and June. Boats run only from November to mid-June.
How warm is the water at Socorro?+
The water runs from about 28 °C when the season opens in November down to about 21 °C in February, then climbs back to about 25 °C by early June. The coolest water coincides with the humpback months, so January to April trips need the most insulation.
How do I get to Socorro Island?+
Only by liveaboard, sailing from Cabo San Lucas or San José del Cabo at the tip of Baja California. The islands lie about 450 km offshore and the crossing takes a day or more each way. There is no airstrip for visitors and nowhere to stay ashore, only a naval station on Socorro.
Is the Revillagigedo Archipelago a marine park?+
Yes. The four islands became a UNESCO World Heritage Site in 2016 and a national park in November 2017, covering about 150,000 km² of sea in which fishing, mining and tourism development are banned. Divers pay a daily park fee on top of the trip price.
Sources
- Archipiélago de Revillagigedo — UNESCO World Heritage Centre
- Revillagigedo Islands — Wikipedia
- San Benedicto Island — Wikipedia
- Socorro Islands dive sites — Dive The World
- When to visit Socorro — Aqua-Firma
- Best time to dive in the Socorro Islands — LiveAboard.com
- Socorro diving: best time to go, giant mantas and sharks — Bluewater Dive Travel
- Socorro Island diving: the complete guide — Mexico Travel Adventure
Photo credits
- A giant oceanic manta ray glides over a scuba diver in open blue water off Socorro Island by Elias Levy, CC BY 2.0, via Wikimedia Commons
- A whitetip reef shark swims low over a rocky volcanic reef in the Revillagigedo Islands by Alberto Alcalá, CC BY 4.0, via Wikimedia Commons
- A pod of dolphins swims through sunlit open water near Isla Socorro, Mexico by Talia Cohen, CC0, via Wikimedia Commons
- A blue-barred parrotfish swims close to the reef near Socorro Island, Mexico by Alberto Alcalá, CC BY 4.0, via Wikimedia Commons
- Two Clarion damselfish shelter among rocky reef growth near Socorro Island by Alberto Alcalá, CC BY 4.0, via Wikimedia Commons
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