20m
    Intermediate
    Kerama Islands, Japan
    久米島

    Tonbara

    Best months: Jun–Aug

    Protected Area

    久米島

    Why dive here

    With 369+ marine species recorded in the area - including barracuda, bull sharks, humpback whales, seahorses and sea turtles - Tonbara offers some of Kerama Islands's richest diving. Water ranges 22-30°C, warmest July, August, September.

    Best timeJun–Aug
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Bull Sharks, Humpback Whales, Seahorses and Sea Turtles · 369+ species recorded
    Water22-30°C · warmest July, August, September
    Charactermax 20m
    StandoutExceptional marine biodiversity

    Tonbara is one of the Keramas’ more exposed sites, and it can sometimes mean a brisk current. We usually see tuna and jacks zipping past the main rock structure, and if you hover a bit, reef sharks will often cruise by. The corals are healthy, mostly hard, and it’s a good spot for intermediate divers looking for a bit more action than the shallower, more sheltered reefs.

    Typical Tonbara Dive Profile

    10m20mSafety Stop0m20m max~30 min estimated bottom time

    Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.

    Safety Notes

    Depth of 20m - Advanced Open Water certification recommended.

    Always perform a 3-minute safety stop at 5m before surfacing.

    Today05:3017:1011h 40m daylightGolden hour 16:40

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    Conditions

    Ocean conditions, forecast and tides for Tonbara

    Tonbara Ocean Conditions

    Monthly averages for Tonbara, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (26.24, 127.37) (1km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    29°C

    83°F · Range: 26.4–30.7°C

    Air Temperature

    26°C

    79°F

    Wind Speed

    9.4 m/s

    18.3 knots

    Atmospheric Pressure

    1014.4 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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