Indian Ocean · France
Mayotte
Resident manta rays clean daily at Passe en S inside the barrier reef lagoon
Photo: Jerome Paillet (IFREMER) · CC BY 4.0
Mayotte's barrier reef encloses one of the largest lagoons in the world, giving divers calm, current-sheltered reef diving inside and current-swept pass dives where the lagoon drains to open ocean. A resident population of reef manta rays visits a cleaning station at Passe en S year-round, and humpback whales — including mothers with calves — are a major seasonal draw between July and September. The lagoon is also one of the last refuges for dugongs in the western Indian Ocean, though sightings are rare.
About diving in Mayotte
A diving day here starts with a crossing. The handful of centres work out of Mamoudzou and the beaches down the west and south coasts, and because the barrier reef sits well offshore, boats spend real time on the water before the first dive: sheltered running inside the lagoon, then swell once you reach the reef line. Trips are usually two dives with the interval spent anchored somewhere calm, and pass dives are timed to the tide, since the flood pushes ocean water in while the ebb drains lagoon silt out through the same gap.
The reef structure is unusual. In places Mayotte carries a double barrier, an outer reef with a second one behind it, and the water inside is a broad plain of seagrass, sand and scattered coral heads rather than continuous reef. That gives three quite different dives: quiet inner-lagoon bommies where the current is negligible and the work is macro, the outer drop-off falling away on the ocean side, and the passes, where the whole lagoon's water has to squeeze past you.
Mantas are why most people come, and because they are resident rather than a seasonal aggregation you are choosing weather instead of chasing an event, though numbers on any given day still vary. The other appeal is quiet: sites get dived by a few boats rather than a fleet, and you are rarely sharing one. It suits divers comfortable with a French-speaking, expensive and thinly served island, who will fill the rest of the trip with seagrass snorkelling over grazing green turtles and, in the right months, whale song audible on a dive.
Best time to dive Mayotte
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Fair | Fair | Fair | Good | Prime | Prime | Prime | Prime | Prime | Good | Fair | Fair |
| Sea surface | 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 29°C84°F | 27°C81°F | 26°C79°F | 26°C79°F | 26°C79°F | 27°C81°F | 28°C82°F | 29°C84°F |
| Daytime high | 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 29°C84°F | 28°C82°F | 27°C81°F | 26°C79°F | 27°C81°F | 28°C82°F | 29°C84°F | 29°C84°F |
| Rain | 256 mm10.1 in | 184 mm7.2 in | 152 mm6.0 in | 92 mm3.6 in | 29 mm1.1 in | 16 mm0.6 in | 15 mm0.6 in | 9 mm0.4 in | 11 mm0.4 in | 19 mm0.7 in | 46 mm1.8 in | 106 mm4.2 in |
| Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|
| Fair | Fair | Fair | Good | Prime | Prime |
| Sea surface | |||||
| 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 29°C84°F | 27°C81°F |
| Daytime high | |||||
| 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 29°C84°F | 28°C82°F |
| Rain | |||||
| 256 mm10.1 in | 184 mm7.2 in | 152 mm6.0 in | 92 mm3.6 in | 29 mm1.1 in | 16 mm0.6 in |
| Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|
| Prime | Prime | Prime | Good | Fair | Fair |
| Sea surface | |||||
| 26°C79°F | 26°C79°F | 26°C79°F | 27°C81°F | 28°C82°F | 29°C84°F |
| Daytime high | |||||
| 27°C81°F | 26°C79°F | 27°C81°F | 28°C82°F | 29°C84°F | 29°C84°F |
| Rain | |||||
| 15 mm0.6 in | 9 mm0.4 in | 11 mm0.4 in | 19 mm0.7 in | 46 mm1.8 in | 106 mm4.2 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.
Dry season (May-Oct) brings calm seas and the clearest water, coinciding with the Jul-Sep humpback whale season; the wet season (Nov-Apr) raises cyclone risk.
Best months: May, June, July, August, September
Mayotte water temperature and weather by month
The sea surface runs from 26 °C (79 °F) in August to 30 °C (86 °F) in March. Most rain falls from December to April, peaking at about 260 mm (10 in) in January; it stays largely dry from May to November. Daytime highs reach 30 °C (86 °F) in April and drop to 26 °C (79 °F) in August. The coldest water here is about 25 °C (77 °F), so pack a 3 mm full suit.
Dive types & marine life
Reef mantas use the pass cleaning stations through the year, so timing is a question of sea state rather than season. Humpbacks arrive July to September and are often audible underwater. May to October brings the calmest water for reef sharks, eagle rays, barracuda and jacks in the passes, with nudibranchs and macro on the inner reefs. Dugongs survive in tiny numbers; do not plan around them.
- Reef
- Wall
- Drift
- Pelagic & blue water
- Muck & macro
- Manta rays
- Sea turtles
- Whales
- Reef sharks
- Dugongs & manatees
- Eagle rays
- Nudibranchs
- Macro critters
- Barracuda
- Trevally & jacks
Best dive sites in Mayotte
A 1906 schooner in 15 m, her masts still above water
Channel & pass
Two dives in one pass: 40 m lagoon side, 60 m ocean side
A drowned riverbed cutting the outer barrier, dived as a drift
A coral wall past 60 m, 300 m off the Dzaoudzi runway
Ilot M'Bouzi
Lagoon reef around a small island reserve with turtles and macro life
How to get to Mayotte
Flights reach Dzaoudzi-Pamandzi on Petite-Terre, usually connecting through Reunion or mainland France, and the passenger ferry across to Mamoudzou on Grande-Terre is the standard onward hop. Centres are based around Mamoudzou and the southern beaches; sites are dived from day boats, and a few lagoon spots can be snorkelled or entered from the beach.
Photos from Mayotte
Axelspace Corporation · CC BY-SA 4.0
D-Stanley · CC BY 2.0
Dive videos
Mayotte Plongée dans un monde sous-marin de Mayotte Heart of the Lagoon A Film by Serge Melesan · Serge Melesan Underwater & Fine Art on YouTube
Photo credits
- Reef fish swimming among branching sponges and coral on a Mayotte lagoon reef by Jerome Paillet (IFREMER), CC BY 4.0, via Openverse
- Satellite view of Mayotte's barrier reef enclosing its turquoise lagoon by Axelspace Corporation, CC BY-SA 4.0, via Wikimedia Commons
- A dolphin swimming just below the surface in Mayotte's lagoon by D-Stanley, CC BY 2.0, via Openverse
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