Osezaki

Verified2026-09-11 checkedMuckMacroReef

A sheltered bay in Suruga Bay with Mount Fuji on the skyline — Tokyo's nearest serious macro diving.

Depth: 3–30 m10–98 ft
Difficulty: Beginner
Entry: Shore
Typical current: Light
Coordinates: 35°1.998′N 138°46.998′E
Activities: Scuba · Freediving

Osezaki is a spit of land reaching into Suruga Bay, and the bay side is sheltered enough to dive when everything else on the peninsula is blown out. The slope is sand and rubble rather than reef, which makes it a macro site: frogfish, nudibranchs, seahorses and mandarinfish at dusk. It is the closest good diving to Tokyo and consequently busy at weekends. Water is cold outside summer and most local divers use drysuits from November.

About three hours by road from Tokyo to the Izu peninsula; shore entry from the beach.

Best season

ExcellentJul–Sep
GoodMay–Jun
GoodOct
FairMar–Apr
FairNov–Dec

Conditions

Water temperature: 25°C77°F
Wave height: 0.4 m1 ft
Air temperature: 20.4°C69°F
Wind speed: 16.5 km/h10.3 mph

Updated 2026-10-07 16:15 UTC · Source: Open-Meteo

Weather data by Open-Meteo.com (CC BY 4.0)

Conditions are reported for information only. Assess the site yourself and follow your guide and your training.

No live conditions for this site yet.

We only show numbers we can attribute to a source.

Sea state and tide

On a date

Tide · 10/8

High02:550.73 m
Low09:16-0.37 m
High15:420.84 m
Low21:47-0.20 m

Forecast heights against mean sea level. Real tides in a bay, a harbour or over a flat can differ — check an official tide table before you get in.

Pick a day to see its tide

Only wave height and wind are scored, because those are what close a boat ramp or a shore entry. Water temperature is reported and never scored: 12°C is an ordinary dive in a drysuit and punishing in a 3 mm, and a number that cannot see your suit has no business marking it down. Stars do not decide whether you get in — you and your guide do, on the day.

Weather data by Open-Meteo.com (CC BY 4.0)

Marine life you may see

Pearl-spot chromisChromis notataCommon
FrogfishAntennarius spp.Common
NudibranchNudibranchiaCommon
MandarinfishSynchiropus splendidusSeasonal
Ornate ghost pipefishSolenostomus paradoxusSeasonal
Shrimp gobyAmblyeleotris spp.Common
FlatwormPseudoceros spp.Common
Common seahorseHippocampus kudaCommon
RazorfishAeoliscus strigatusCommon
Feather starCrinoideaCommon

From divers

What people who were in the water reported. Not a forecast, and not a judgement about whether the site is safe to dive.

No recent reports from divers. If you dived here in the last two weeks, you can say how it was.

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