Hiroshima Weather in September

Season: Autumn
In short: moderate precipitation and temperature, best visit time

Floating Otorii Gate of Itsukushima Shrine

Though stepping into autumn, Hiroshima is still a little hot in the first half of September, when the highest temperature is usually above 30°C (86°F). Then, in general, the temperature drops to a warm level in the second half, and it may even be a little cold in the morning and at night. But the weather can be different one year from another. For instance, in 2023, the weather was hotter than normal, and the highest temperature was above 30°C (86°F) on most days of the whole month. So you’d better check the weather forecast to confirm the real-time climate before you go to Hiroshima in September 2025. Besides, the daytime becomes short, so you need to arrange your daytime activities properly. In terms of rainfall, it is at a relatively moderate level, and you don’t need to worry that it will influence your trip a lot.

September is one of the best months to travel to Hiroshima. However, you should note that September 14-16 is a public holiday in Japan, when the traffic is crowded and the hotels and airplanes are expensive and difficult to book, so you are advised to make bookings in advance to avoid disruption to your travel plans.

Averages for Hiroshima Weather in September

Items	Data
Average Highest Temperature	28°C (82.4°F)
Average Lowest Temperature	22°C (71.6°F)
Average Temperature	25°C (77°F)
Precipitation	166.8 mm
Average Rainy Days	10 days
Average Humidity	68%
Sunrise Time	5:43 - 6:04
Sunset Time	17:55 - 18:36
Daylight Hours	11.52 - 12.52 h
Average Sunshine Hours	5.5 h

Packing List

Clothes: In early September, you can still wear some summer clothes like T-shirts or short shirts together with light pants. Then, in the second half of the month, you should put on a thin shirt or thin knitwear outside the T-shirts or short shirts, and match the tops with jeans or sweatpants, especially in the mornings and evenings.

Shoes: Taking the climate of Hiroshima and your possible activities into consideration, thin sneakers and walking shoes are recommended.

Others: A cap and sunglasses to protect you from the UV rays are recommended to bring.

Recommended Places to Visit in Hiroshima in September

Tourism Rate:

In September, especially in later month, the weather of Hiroshima is comfortable with moderate temperature and rainfall. Therefore, you can visit both natural landscapes and human landscapes, and both outdoor and indoor places at will. Besides, hiking and cycling are also recommended. Based on this, you can go to the following places:

1. Shukkei-en

Rebuilt after the atomic bombing, Shukkei-en includes the pond, islands, bridges, and various plants and flowers, presenting a beautiful and harmonious scenery. It is a good place to take a stroll in all seasons. The most famous and representative view here is the round arch bridge above the pond. In addition, exhibitions and activities related to traditional Japanese culture are held from time to time.

Scenery of Shukkei-en in September

2. Atomic Bomb Dome and Hiroshima Peace Memorial Park

Located in the center of Hiroshima and near the epicenter of the atomic bombing during World War II, the Hiroshima Peace Memorial Park was built in the hope of world peace. The park is home to the Hiroshima Peace Memorial Museum, which exhibits things left over from the atomic bombing; the Cenotaph for the A-Bomb Victims, where the names of all victims are inscribed; Peace Bell, the surface of which is embossed with a map of the world without borders, symbolizing “one world”; Children’s Peace Monument, which commemorates the children who lost their lives in the atomic bombing; and the peace flame, which burns all the time until when all nuclear weapons are removed from the earth. The Atomic Bomb Dome, a World Heritage Site and the symbol of the devastation caused by the first atomic bomb in human history, is located near the park and worth visiting together.

Atomic Bomb Dome in September

3. Shimanami Kaido

On sunny days, it is recommended to rent a bicycle at Shimanami Kaido to enjoy the beautiful scenery of the Seto Inland Sea. The Shimanami Kaido cycling trail is well developed, with a whole length of about 70 kilometers (44 miles), and it can be completed in about 6 hours. Along the way, there are beautiful islands, bridges, coastlines, and many human attractions such as shrines and museums. Among them, the Kirosan Observatory Park should not be missed. Standing on the deck, you can enjoy a 360-degree panoramic view of the Seto Inland Sea. If you don’t want to ride the whole route, there are a total of 14 stops on the way, and you can stop at any time.

September Weather for Other Cities in Japan:

Hiroshima Weather by Month

January February March April May June July August September October November December

7-Day Hiroshima Weather Forecast