Suō Ōshima Island

Japanese island in Yamaguchi Prefecture

An island in Yamaguchi Prefecture known for beaches, cycling routes and citrus orchards; ferries link it to the mainland for day trips and seasonal festivals.

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Chugoku-JR-Bus 334-2074.jpg
Dakesan observatory and radio tower.jpg
Dakesan observatory terrace.jpg
Dakesan Triangulation station.jpg
Japan Ymagichi YashiroDam Bird.JPG
Kasasajima Island and Kumage Peninsula from train of Sanyo Main Line.jpg
Mukunonohokulea.jpg
Oshima route monument.jpg
Oshima-BC.jpg

Suō Ōshima at a Glance#

How to Get to Suō Ōshima#

Ferries run from ports on Yamaguchi Prefecture’s coast; schedules vary seasonally. The nearest major rail connection is on the mainland-travelers typically transfer from Shimonoseki or other regional hubs and take a local bus or taxi to the ferry terminal.

Tips for Visiting Suō Ōshima#

  • Expect limited tourist infrastructure-book accommodation on nearby larger islands.
  • Respect local fisheries-some areas are restricted during spawning seasons.
  • Bring cash for small local purchases; card facilities may be scarce.

Best Time to Visit Suō Ōshima#

Summer offers best access for ferry services and sea conditions; shoulder seasons are quieter.

Summer
June-August · 22-30°C (72-86°F)
Warmest time for sea travel and island-hopping; ferry schedules more frequent.
Late Spring
May-June · 18-24°C (64-75°F)
Quieter than peak season with comfortable weather for exploration.

Weather & Climate near Suō Ōshima#

Climate

Suō Ōshima's climate is classified as Humid Subtropical - Humid Subtropical climate with hot summers (peaking in August) and cold winters (coldest in January). Temperatures range from 0°C to 28°C. Abundant rainfall (1876 mm/year), wettest in June.

Air Quality: AQI 54 Moderate
Best Time to Visit
AugustSeptemberJuly
Temperature & Rainfall
Temperature Range
36°
Warmest Month
-3°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January Poor 0° - 7° 0° 54 mm overcast 75% 4.2 m/s 0.4 low 10.1h
February Poor 0° - 7° 0° 80 mm partly cloudy 75% 4.1 m/s 0.7 moderate 10.9h
March Acceptable 3° - 11° 4° 128 mm partly cloudy 75% 3.8 m/s 1.0 moderate 11.9h
April Good 8° - 16° 12° 187 mm partly cloudy 76% 3.8 m/s 1.3 high 12.9h
May Acceptable 13° - 20° 16° 193 mm overcast 79% 3.6 m/s 1.6 very high 13.8h
June Good 17° - 23° 20° 306 mm overcast 83% 3.5 m/s 1.5 very high 14.2h
July Good 21° - 27° 24° 285 mm overcast 86% 3.7 m/s 1.8 very high 14.0h
August Very Good 22° - 28° 25° 180 mm partly cloudy 83% 4.1 m/s 1.9 very high 13.2h
September Very Good 18° - 25° 22° 214 mm partly cloudy 81% 3.7 m/s 1.4 high 12.3h
October Good 13° - 20° 16° 123 mm partly cloudy 76% 3.5 m/s 1.0 moderate 11.2h
November Acceptable 7° - 15° 11° 78 mm partly cloudy 75% 3.9 m/s 0.6 moderate 10.3h
December Acceptable 2° - 10° 3° 48 mm overcast 76% 4.1 m/s 0.4 low 9.8h