Atauro Island tide times

Atauro Island sits 30 kilometres north of Dili in the Wetar Strait, an elongated volcanic island approximately 25 kilometres long and 9 kilometres wide. The island rises steeply from the coast to a central spine above 900 metres — the forested ridges are visible from the Dili waterfront on clear days. Under Indonesian occupation (1975 to 1999), Atauro served as a detention island for East Timorese political prisoners and resistance members. Since independence, it has developed a small-scale ecotourism economy: several community-run guesthouses, a fishing-community market, and the diving that brought the island to international scientific attention.

In 2016, a Conservation International reef survey team conducted systematic fish species counts around Atauro's reefs. The results were extraordinary: 642 species of reef fish recorded in a single survey, the highest count ever documented on a coral reef. The finding attracted immediate scientific attention and positioned Atauro as a globally significant marine biodiversity site. The diversity reflects Atauro's position at the confluence of Pacific and Indian Ocean water masses in the Wetar Strait, its geological history, and the relatively low fishing pressure the island's small population has exerted on the surrounding reef.

The tidal channel between Atauro and Dili is a significant body of water. Spring tidal range at Atauro is approximately 1.5 to 2.0 metres, driven by the Wetar Strait's Indonesian throughflow tidal dynamics. The tidal current through the Atauro Passage — the strait between the island and the Timor-Leste mainland — reaches 1 to 2 knots at spring peaks, flowing northward (into the Banda Sea) on the flood and southward on the ebb. This current brings nutrient-rich water over the reef and is the mechanism behind the high productivity that supports the record fish diversity.

The reef system around Atauro has three distinct environments: the fringing reef accessible from shore in 2 to 5 metres; the reef slope in 10 to 30 metres; and the outer wall in 30 to 60+ metres. The shallow fringing reef is snorkellable from most of the island's western coast directly from the beach — the gravel and sand beach at Vila (the main village) gives access to the house reef in 50 metres. The fish density in the shallow zone is remarkable: parrotfish, wrasse, damselfish, and butterflyfish in concentrations that are unusual for a site accessible from shore.

Dive operations on Atauro are community-based: several dive operators have established here, using local fishermen as boat operators and training local guides. The dive tourism income is distributed to the community directly, a model that aligns economic incentives with reef protection. Diving visits require advance booking through Dili-based operators or directly with the Atauro guesthouses.

For non-divers, the snorkel at Vila village is the single most recommended activity. The fish density in 2 to 4 metres within 100 metres of the beach is extraordinary by global standards. A mask and snorkel rented from the guesthouse is the only equipment needed.

Predictions on this page come from Open-Meteo Marine, a gridded global ocean model. Accuracy is typically within plus or minus 45 minutes on timing and 0.2 to 0.3 metres on height — model-derived, not from a local gauge. The local tide authority is the Autoridade Nacional de Meteorologia e Geofísica de Timor-Leste (ANMG).