Stone Town's dive sites range from shallow beginner reefs to boat-access pinnacles, walls, and a pair of wrecks. The Green Sea Turtle is a consistent presence, alongside the Bluestreak Cleaner Wrasse, Powder-blue Surgeonfish, and Twoband Clownfish across most sites. Two Stones channels current through its twin pinnacles for drift diving, while the Royal Navy Lighter offers a deeper wreck experience. February, March, and October stand out as the most popular months.
Monthly water temperature across Stone Town's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water stays warm year-round, with the coolest period from July through September and the warmest months clustered around February, March, and October. Those cooler mid-year months still offer comfortable diving and tend to align with a second peak in diver activity. February, March, and October historically see the highest interest, likely reflecting calmer conditions and strong visibility on the outer boat sites.
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Water temperature around Stone Town ranges from about 26°C in July to 29°C in January, based on satellite sea-temperature data for its dive sites.
In the warm season (about 29°C) a rash guard or 3mm shorty is comfortable in Stone Town; in the coldest months (about 26°C) step up to a 3mm full suit.
Fin maps 17 sites in Stone Town (14 scuba diving sites and 3 snorkelling spots).
Across Stone Town's dive sites, February, March, June and October are most often reported as the best months to visit.
Green Sea Turtle is observed at roughly half of all sites and is considered a signature species for the area. Very common species across the sites include Bluestreak Cleaner Wrasse, Valentini Pufferfish, Powder-blue Surgeonfish, and Twoband Clownfish. Occasional sightings include Bluespotted Fantail Ray, Grey Reef Shark, and Napoleon Wrasse. Whale Shark has also been recorded.
The majority of sites in Stone Town are rated for beginners, including Chumbe Reef Sanctuary, Ukumbe Reef, Bawe Reef, and The Great Northern wreck. These cover a range of types from shallow reef to wall topography, giving newer divers plenty of variety. Two Stones and the Royal Navy Lighter are rated intermediate and advanced respectively, offering progression as skills develop.
Almost all dive sites in Stone Town require boat access, including the wrecks, pinnacles, and outer reefs. Chumbe Reef Sanctuary is the notable exception, accessible from shore. Operators such as One Ocean Dive Centre are based in the area and can arrange boat transfers to the full range of sites.
Stone Town offers a varied mix including coral reefs, walls, pinnacles, and two distinct wrecks: The Great Northern, a shallow wreck suited to beginners, and the Royal Navy Lighter, a purposely sunk vessel for advanced divers. Pinnacles and Aquarium feature overhangs, arches, and wall topography, while Two Stones creates drift conditions by channelling current between its twin pinnacle structures.
