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Hiroshima Bay

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Hiroshima Bay Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Hiroshima Bay year round climate

  • Spring (March–May): Average 11.3–19.4°C, warm and rainy climate. Cherry blossoms may start blooming in March, but rainfall is relatively high, so be sure to bring rain gear. Common activities: Cherry blossom viewing (if cherry blossoms are in bloom), visiting Miyajima Island, strolling around the city. Recommended clothing: Light jacket, long-sleeved shirt, rain gear.
  • Summer (June–August): Average 23.3–30.0°C, hot and humid with relatively high rainfall, especially in July. Common activities: Swimming at the beach, hiking in the mountains to escape the heat, enjoying local cuisine. Recommended clothing: Light and breathable clothing, sun hat, sunscreen.
  • Autumn (September–November): Average 15.2–27.6°C, pleasant and comfortable climate with gradually decreasing rainfall. Common activities: Autumn leaf viewing (in some areas), outdoor activities, enjoying the crisp autumn scenery. Recommended clothing: Light jacket, long-sleeved shirt.
  • Winter (December–February): Average 6.5–8.3°C, cold and dry climate with low rainfall. Common activities: Indoor sightseeing, enjoying local cuisine, onsen (hot spring) experience. Recommended clothing: Warm clothing, thick jacket, scarf and gloves.

Hiroshima Bay climatological average

Annual average temperature: approx. 17.8°C / Annual rainfall: approx. 1940 mm / Summer humidity: 70%–80% / Rainiest month: July

Hiroshima Bay monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
6.5°C
54.5
February
7.1°C
101
March
11.3°C
166.4
April
16.3°C
238.8
May
19.4°C
199.4
June
23.3°C
297.4
July
28.2°C
306.2
August
30°C
137.9
September
27.6°C
190
October
20.4°C
77.9
November
15.2°C
129
December
8.3°C
41.6

Hiroshima Bay weather for the next seven days

4/27
Monday
Patchy rain nearby
20.3°C/12.2°C
4/28
Tuesday
Partly Cloudy
21.2°C/12.2°C
4/29
Wednesday
Partly Cloudy
15.4°C/10.9°C
4/30
Thursday
Overcast
15.2°C/9.8°C
5/1
Friday
Sunny
19.8°C/8.7°C
5/2
Saturday
Sunny
20.3°C/10.6°C
5/3
Sunday
Partly Cloudy
19.5°C/12.7°C

Hiroshima Bay Frequently Asked Questions and Useful Information for Travel

Can you swim in Hiroshima Bay?

Yes, you can enjoy swimming in Hiroshima Bay. The sandy beach along the coast is recognized as one of Japan's best, attracting many swimmers during the summer months. Besides swimming, activities like sea kayaking are also popular.

How deep is Hiroshima Bay?

Hiroshima Bay has a mean depth of 25 meters (82 feet). The bay's shoreline is characterized as a Ria, and its surface area is approximately 1,000 square kilometers (390 sq mi).

What is the famous island in Hiroshima Bay?

Miyajima is a small island located less than an hour outside the city of Hiroshima, and is often associated with Hiroshima Bay. It is most renowned for its iconic giant torii gate, which appears to float on the water at high tide.

Where do cruise ships dock for Hiroshima Bay?

Cruise ships visiting Hiroshima typically dock at Ujina Foreign Trade Wharf. This facility is located about 3 kilometers from the city center and its 280-meter dock can accommodate ships with drafts up to 10 meters.

What activities can be enjoyed in Hiroshima Bay?

Visitors to Hiroshima Bay can engage in a variety of activities, including swimming and sea kayaking in the bay's waters. The beautiful sandy beaches also offer opportunities for relaxation and recreation.