Kōzu-shima
Island Volcanic island in Izu archipelago with beaches
An Izu island administered by Tokyo, Kōzu-shima attracts day-trippers for sandy coves, coastal hiking and marine activities; visitors sample local seafood and use simple guesthouses as a base for snorkeling and fishing.
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Kōzu-shima (Kozushima) is an inhabited volcanic island in the Izu Islands, administered as part of Tokyo Prefecture and located in the Philippine Sea. The island combines volcanic topography with coastal beaches and small fishing settlements.
Visitors use short hiking trails and coastal paths to reach viewpoints and the island’s summits; the highest point, Mt Tenjō, rises to about 570 meters and affords wide views of the surrounding archipelago. The coastline offers rocky shelves and small sandy coves that are popular for snorkeling and coastal walks.
The island’s economy centers on fishing and seasonal tourism, with ferry connections to other Izu islands and to the Izu Peninsula. Settlement and harbor areas are compact, and services for visitors are concentrated around the main ports.
Kōzu-shima is located within the Izu archipelago southwest of the Izu Peninsula and is one of the more remote Tokyo-administered islands in the Pacific.
- Administrative status: Part of the Izu Islands group and administered as part of Tokyo Prefecture, the island has a volcanic origin and an inhabited village cluster with small harbors.
What to See #
- Mt Tenjō (summit): Mt Tenjō is the island's highest summit at roughly 570 meters, accessible by hiking routes that provide panoramic coastal views.
How to Get to Kōzu-shima #
Ferry and high-speed boat services connect Kozushima with Tokyo ports (Takeshiba, Shimoda) and neighboring Izu islands; services are seasonal and weather-dependent. From Tokyo, travelers typically take a boat from Takeshiba or a domestic flight to nearby islands followed by a ferry transfer.
Tips for Visiting Kōzu-shima #
- If arriving by ferry, pick a calmer day-sea conditions can be choppy and small ports have limited shelter.
- Hike the island's north coast early in the day for wildflower displays and fewer people.
- Bring a mask and snorkel if visiting in summer: there are surprisingly clear bays for quick swims.
Best Time to Visit Kōzu-shima #
Late spring through early autumn for marine access and hiking; check weather for ferry schedules.
Weather & Climate near Kōzu-shima #
Kōzu-shima's climate is classified as Humid Subtropical - Humid Subtropical climate with hot summers (peaking in August) and cold winters (coldest in February). Temperatures range from 6°C to 28°C. Heavy rainfall (2460 mm/year), wettest in June.
January
January is cold with highs of 13°C and lows of 7°C. Significant rainfall (107 mm) and partly cloudy skies.
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February
February is the coolest month with highs of 12°C and lows of 6°C. Significant rainfall (129 mm) and partly cloudy skies.
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March
March is cool with highs of 14°C and lows of 8°C. Heavy rain (201 mm) and partly cloudy skies.
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April
April is cool with highs of 18°C and lows of 12°C. Heavy rain (208 mm) and partly cloudy skies.
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May
May is mild with highs of 21°C and lows of 15°C. Heavy rain (226 mm) and mostly overcast skies.
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June
June is mild with highs of 23°C and lows of 18°C. The wettest month with heavy rain (308 mm) and mostly overcast skies.
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July
July is warm with muggy conditions (dew point 24°C). Heavy rain (204 mm) and mostly overcast skies.
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August
August is the warmest month with stifling humidity (dew point 25°C). Heavy rain (230 mm) and partly cloudy skies.
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September
September is mild with muggy conditions (dew point 22°C). Heavy rain (282 mm) and partly cloudy skies.
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October
October is mild with highs of 22°C and lows of 17°C. Heavy rain (272 mm) and partly cloudy skies.
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November
November is cool with highs of 19°C and lows of 13°C. Significant rainfall (187 mm) and partly cloudy skies.
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December
December is cool with highs of 15°C and lows of 9°C. Significant rainfall (106 mm) and partly cloudy skies.
