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Data: Global Land Cover Facility (GLCF) Snip: っ CC BY-SA 4.0 Wikimedia Commons

Izu Ōshima

Island

The largest of the Izu Islands administered by Tokyo, Izu Ōshima is dominated by volcanic Mt. Mihara. Visitors arrive by ferry for crater hikes, coastal beaches, cycling routes, hot springs, and seasonal island festivals.

Izu Ōshima Asakusa & Ueno Bunkyo Ginza &Nihonbashi Ikebukuro Meguro &Nakameguro Nakano Odaiba & Koto Roppongi& Minato Shibuya &Harajuku Shinagawa Shinjuku Sumida &Tokyo Skytree Tokyo Station &Imperial Palace Tourist areas, not official boundaries. Map data © OpenStreetMap contributorsTokyo TowerMeiji ShrineShibuya CrossingNakasendo TrailNational Art CenterTokyo Photographic Art MuseumThe National Museum of Modern ArtMeguro Parasitological MuseumYasukuni ShrineTokyo DomeIzu Ōshima
In this guide

Izu Ōshima essentials

Address: Izu Ōshima, Izu Islands, Tokyo Prefecture, Japan
Admission: Ferry and park fees vary; entry to certain attractions (like hiking trails or campgrounds) may carry small local fees.
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About Izu Ōshima

Izu Ōshima is a volcanic island in the Izu archipelago administered as part of Tokyo Metropolis, Japan. The island’s most notable feature is the active volcano Mount Mihara, which dominates the landscape.

The island offers hiking on volcanic trails, coastal roads with sea views and small port settlements. The crater rim on Mount Mihara rises to about 764 metres and is a primary destination for day hikes; Motomachi is the main arrival point for ferries and boats.

The island formed through repeated volcanic eruptions; Mount Mihara has produced recorded eruptions in the 20th century, most recently causing evacuations in the 1980s. Administration falls under Oshima Town within Tokyo Metropolis and local infrastructure developed around maritime and air links to the mainland.

Izu Ōshima sits in the Philippine Sea roughly south of mainland Tokyo, at the northern end of the Izu Islands chain. The island is reachable by ferry and by short regional flights from the Tokyo area, and its terrain is dominated by volcanic slopes and a rocky coastline.

  • Active volcano: Active volcano status means eruption alerts and access restrictions can be issued; check Tokyo Metropolitan or local Oshima town notices before travel.
  • Viewing points: Best viewpoints are the crater rim and coastal roads on the island’s east side, which offer clear views of the volcano and surrounding ocean on calm days.

What to See#

  • Mount Mihara: Prominent volcanic summit on the island, rising to about 764 metres and featuring a well-defined crater rim that is accessible by marked trails.
  • Motomachi Port: Motomachi, the island’s main port and settlement, which is the primary ferry and passenger-boat landing for services to and from mainland Tokyo.
  • Izu Ōshima Airport: Izu Ōshima Airport, a small regional airfield serving scheduled flights from the Tokyo area and providing the fastest access to the island.
Things to Do
When to Go

Best Time to Visit Izu Ōshima

Spring and summer are the most popular times: spring for cherry blossom displays, summer for beach and festival activities.

Spring (cherry blossoms)
March-April · 10-18°C
Izu Ōshima is famous for late-blooming sakura fields against a volcanic backdrop.
Summer
June-August · 20-30°C
Warm sea temperatures and festival season; busiest tourist period.

Weather & Climate near Izu Ōshima

Climate

Izu Ōshima's climate is classified as Humid Subtropical - Humid Subtropical climate with warm summers (peaking in August) and cold winters (coldest in February). Temperatures range from 1°C to 27°C. Heavy rainfall (2155 mm/year), wettest in June.

Air Quality: AQI 44 Good
Best Time to Visit
AugustSeptemberJuly
Temperature & Rainfall
Temperature Range
30°
Warmest Month
3°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January Acceptable 1° - 10° 1° 83 mm partly cloudy 69% 6.0 m/s 0.4 low 10.0h
February Acceptable 1° - 10° 1° 102 mm partly cloudy 71% 5.7 m/s 0.6 moderate 10.8h
March Acceptable 3° - 12° 5° 167 mm partly cloudy 71% 5.4 m/s 0.9 moderate 11.8h
April Good 8° - 17° 12° 178 mm partly cloudy 75% 5.3 m/s 1.2 high 12.9h
May Acceptable 12° - 20° 16° 194 mm overcast 81% 4.7 m/s 1.5 high 13.8h
June Good 16° - 22° 19° 268 mm overcast 88% 4.3 m/s 1.5 very high 14.3h
July Good 19° - 26° 23° 193 mm overcast 90% 4.1 m/s 1.8 very high 14.1h
August Very Good 21° - 27° 24° 241 mm partly cloudy 87% 4.3 m/s 1.8 very high 13.3h
September Very Good 18° - 25° 21° 268 mm partly cloudy 82% 4.4 m/s 1.4 high 12.3h
October Acceptable 13° - 20° 17° 236 mm partly cloudy 76% 6.0 m/s 0.9 moderate 11.2h
November Good 9° - 16° 12° 146 mm partly cloudy 72% 5.4 m/s 0.5 moderate 10.2h
December Acceptable 4° - 12° 5° 79 mm partly cloudy 70% 5.4 m/s 0.4 low 9.7h
Getting There & Around

How to Get to Izu Ōshima

High-speed ferries and slower car ferries depart Tokyo (Takeshiba, Takeshiba to Oshima) and from other Izu Islands; crossing time varies with vessel. Check ferry company timetables and book in advance during peak season.

Tips for Visiting Izu Ōshima

  • Take the ferry from Takeshiba or from Tokyo's Odaiba area - check schedules as crossings are weather-dependent.
  • If visiting to see Mount Mihara's volcanic landscape, stick to marked paths; some areas remain geothermally active.
  • Book accommodation early for the island's few guesthouses during sakura season and summer.