When the Seychelles Plateau blooms each southern autumn, whale sharks filter through productive shelf waters around Mahé and neighboring islands. Local operators run snorkel and swim trips from Victoria and Beau Vallon, with encounters tied to plankton rather than feeding platforms. September and October deliver the sharpest seasonal spike before sharks disperse.
When the Seychelles Plateau blooms each southern autumn, whale sharks filter through productive shelf waters around Mahé and neighboring islands. Local operators run snorkel and swim trips from Victoria and Beau Vallon, with encounters tied to plankton rather than feeding platforms. September and October deliver the sharpest seasonal spike before sharks disperse.
Up to 90% sighting chance in Seychelles Plateau (Mahé and surrounding waters). Best months: September, October, August.
Sightings peak from August through October, with September and October usually strongest as plankton blooms build across the Seychelles Plateau shelf waters around Mahé.
Most operators leave from Beau Vallon, Victoria, or nearby marinas on half-day snorkel trips when sharks are reported on the plateau. Transfers are short compared with Indian Ocean expedition destinations.
Yes. Encounters are wild and plankton-driven, without the artificial feeding used at controversial sites elsewhere in Asia. Local guides enforce approach distances on open-water snorkel sessions.
Southern autumn brings calm mornings and warm 27 to 29 degree Celsius water, though afternoon wind can chop surface visibility. Operators often launch early when plankton slicks are easiest to spot from the panga.
Half-day snorkel excursions typically run 90 to 180 US dollars per person depending on operator, group size, and whether gear is included (2026 prices). Private boat charters cost more but offer flexible routing when sharks move.
