Hachijō-kojima
Island Volcanic island in the Izu archipelago, Japan
Small volcanic islet in the Izu archipelago off Hachijō‑jima; accessed by boat, it draws day‑trippers for coastal scenery and short excursions.
A small, uninhabited volcanic islet in the Izu Islands chain administered as part of Tokyo, Japan. The island is characterised by rocky cliffs, volcanic topography and coastal bird and marine habitats rather than visitor infrastructure.
The islet was inhabited in the past but was abandoned in the mid twentieth century; remaining traces of settlement and former cultivation are visible in places. Today it is primarily visited by specialist boat trips and divers rather than regular passenger services.
Landing is infrequent and requires arranging private transport; there are no services or buildings for visitors on the island. Marine and birdlife around the island attract divers and naturalists rather than mass tourism.
Hachijō-kojima lies close to the larger inhabited island of Hachijō-jima in the Izu archipelago and is part of the same municipal administration within Tokyo.
- Access: There is no regular public transport service from inhabited islands; visits normally require a private boat or charter and landing is without facilities.
- Wildlife and facilities: The island hosts seabird colonies and shoreline reef areas that are of interest to divers and wildlife observers, but there are no visitor amenities on the island itself.
How to Get to Hachijō-kojima #
Regular passenger ferries run from Tokyo-area ports (check services from Tokyo’s Takeshiba or Shimoda), but schedules can be seasonal; air service is available from Hachijōjima with connections depending on weather. On arrival, the island is compact enough to explore by rented bicycle, local taxi, or on foot.
Tips for Visiting Hachijō-kojima #
- Ferries to Hachijō-kojima are infrequent; check schedules and book the ship or flight in advance, especially during summer and Obon holidays.
- If landing by plane, the small airstrip is weather-dependent - have contingency plans as flights are cancelled in high winds.
- Bring a headlamp for evening walks: the island's small settlements are quiet after dark but the night sky is excellent for stargazing.
Best Time to Visit Hachijō-kojima #
Accessible year-round but most comfortable in late spring and autumn; summer brings sea activity and busy ferry schedules.
Weather & Climate near Hachijō-kojima #
Subtropical climate with hot summers (peaking in August) and cool winters (coldest in February). Temperatures range from 9°C to 28°C. Heavy rainfall (2648 mm/year), wettest in October.
January
January is cool with highs of 16°C and lows of 10°C. Significant rainfall (133 mm) and mostly overcast skies.
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February
February is the coolest month with highs of 15°C and lows of 9°C. Significant rainfall (148 mm) and mostly overcast skies.
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March
March is cool with highs of 16°C and lows of 11°C. Heavy rain (203 mm) and mostly overcast skies.
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April
April is cool with highs of 19°C and lows of 14°C. Heavy rain (215 mm) and mostly overcast skies.
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May
May is mild with highs of 22°C and lows of 17°C. Heavy rain (258 mm) and mostly overcast skies.
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June
June is mild with highs of 24°C and lows of 20°C. Heavy rain (329 mm) and mostly overcast skies.
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July
July is warm with stifling humidity (dew point 24°C). Significant rainfall (181 mm) and mostly overcast skies.
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August
August is the warmest month with stifling humidity (dew point 25°C). Heavy rain (210 mm) and partly cloudy skies.
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September
September is warm with muggy conditions (dew point 23°C). Heavy rain (286 mm) and partly cloudy skies.
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October
October is mild with highs of 24°C and lows of 19°C. The wettest month with heavy rain (332 mm) and mostly overcast skies.
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November
November is mild with highs of 21°C and lows of 16°C. Heavy rain (220 mm) and mostly overcast skies.
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December
December is cool with highs of 18°C and lows of 12°C. Significant rainfall (133 mm) and mostly overcast skies.
