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Okunoshima Island

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Okunoshima Island Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Okunoshima Island year round climate

  • Spring (March–May): Average 9.3–17.8°C, mild climate but with relatively high rainfall, especially in April. Common activities: Outdoor walks, sightseeing. Recommended clothing: Light jacket, comfortable long pants, rain gear.
  • Summer (June–August): Average 21.6–27.6°C, hot and humid with frequent rainfall. Common activities: Beach activities, swimming (exercise caution), island exploration. Recommended clothing: Light and breathable clothing, sun hat, rain gear.
  • Autumn (September–November): Average 17.6–25.2°C, comfortable and pleasant climate with gradually decreasing rainfall. Common activities: Hiking, enjoying autumn scenery. Recommended clothing: Light jacket, long-sleeved shirts and pants.
  • Winter (December–February): Average 4.0–5.5°C, cold and dry with low rainfall. Common activities: Indoor activities, appreciating the island's winter scenery. Recommended clothing: Warm jacket, hat, gloves, scarf.

Okunoshima Island climatological average

Annual average temperature: approx. 15.5°C / Annual rainfall: approx. 1332 mm / Summer humidity: 70%–80% / Rainiest month: June

Okunoshima Island monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
4°C
32.6
February
4.6°C
68.9
March
9.3°C
119.1
April
14.7°C
138.9
May
17.8°C
154.7
June
21.6°C
197
July
26.2°C
170.5
August
27.6°C
163.9
September
25.2°C
103.4
October
17.6°C
72.7
November
12.5°C
87.6
December
5.5°C
23.3

Okunoshima Island weather for the next seven days

12/15
Monday
Sunny
8.9°C/2.3°C
12/16
Tuesday
Sunny
10.8°C/3°C
12/17
Wednesday
Moderate rain
12.2°C/6.2°C
12/18
Thursday
Sunny
10.5°C/5.5°C
12/19
Friday
Sunny
13.6°C/5.2°C
12/20
Saturday
Sunny
14.4°C/7.4°C
12/21
Sunday
Sunny
14.8°C/9.1°C

Okunoshima Island Frequently Asked Questions and Useful Information for Travel

Is Okunoshima Island worth visiting?

Okunoshima Island offers a unique blend of natural beauty, fascinating history, and adorable wildlife. Even if you are not an animal lover, but are rather a history buff, Okunoshima is still well worth a visit. Although Japan was a signatory to the 1925 Geneva Protocol prohibiting chemical warfare, just four years later in 1929, a secret chemical weapons factory was built on Okunoshima, the history of which is explored at the Okunoshima Poison Gas Museum.

What is Okunoshima famous for?

Okunoshima, also known as Rabbit Island or Usagi Shima, is situated in the eastern part of Hiroshima prefecture. Accessible via a quick 15-minute ferry ride from the mainland, this tiny tourist destination has become recognized around the globe for its fascinating bunny population.

Can you stay overnight on Okunoshima Island?

Yes, you can stay on Okunoshima Island. There is the Kyukamura Okunoshima hotel on the island, where you can stay overnight. The hotel also offers facilities for day-use bathing, camping, cycling, fishing, and other activities, making it a great place to spend a relaxing day.

What are some historical sites to see on Okunoshima Island?

Okunoshima Island has several intriguing historical remains that offer a glimpse into its past. These include the Southern Fort Remains, the Ocean Water Tank Remains, the Power Plant Ruins, and the Gunpowder Storehouse Remains.

What is the Okunoshima Island Poison Gas Museum?

The Okunoshima Island Poison Gas Museum is a significant historical site on the island. It tells the often horrific story of poison gas production that took place on Okunoshima during a secretive period in history.