Nagasaki Weather in October

Season: Autumn

In short:
1. The temperature of October generally shows a downward trend but maintains at a comfortable level.
2. Rainfall is mild on the whole, and heavy rainy weather occurs in rare cases.
3. The ultraviolet rays are moderate.
4. The highlight of Nagasaki trip in October is the Nagasaki Kunchi, which is held from October 7th to 9th every year.

Taking Photos of Sunset in Mount Inasa

Dropping Temperature

Nagasaki has finally bid farewell to the hot weather in October. On the whole, the average monthly high temperature is very cozy, at 25 degrees Celsius (77 degrees Fahrenheit); the average monthly low temperature is cooler, at 18℃ (64.4℉).

Throughout the entire month of October, the highest temperature does not exceed 30-31℃ (86-87.8℉) which, usually occurs in the very beginning of the month. From the early days to the late month, the temperature generally shows a trend of gradually dropping. By the end of the month, the maximum temperature is usually about 18-23℃ (64.4-73.4℉), while the minimum temperature is mostly at 13-15℃ (55.4-59℉).

Precipitation & Humidity

The rainy weather of Nagasaki in October is the least throughout the whole year, with an average of 13 rainy days, and the monthly average precipitation is at a relatively low level of 110mm. There are only about 2-5 days when daily precipitation reaches above 15mm. Thus, it can be said that the autumn rain in October is mostly mild.

Because of Nagasaki’s location near the sea, there is still a relatively high humidity averaging 69% in October.

Dejimamachi Washed by Rainfall

Daylight Hours & Sunshine Hours

As autumn progresses further in October, the sun rises later than before, at around 6:23, and sets a little earlier at around 17:48. However, you still have an average of 11.4 hours of daylight each day enjoying your trip. The sunlight duration in October, the mid-autumn month, averages about 6 hours daily, when you can bask in the warm sunshine.

You might concern more about the UV (ultraviolet) conditions of this month. Don’t worry too much since the UV index has dropped to 6, a moderate level. However, relevant protective measures like applying sunscreen and using a parasol, etc. are still necessary on brightly sunny days.

Sunset Glow in Nagasaki Train Station

Extreme Weather

Extreme weather seldom occurs in October. Generally speaking, the wind in Nagasaki in October is quite mild. Nevertheless, the possibility of the typhoon attack cannot be ruled out.

Is October an Optimal Month to Visit Nagasaki?

Yes. October is definitely one of the BEST months to visit Nagasaki.

To start with, in October, there is no big climatic restrictions on your trip since the temperature is cozy, rainfall is mild generally, and the sunlight is moderate. Therefore, you can enjoy visiting any attractions comfortably, including indoor tours in the Atomic Bomb Museum and the Nagasaki Museum of History & Culture; or outdoor sightseeing like the Nagasaki Seaside Park, the Glover Garden, and the Meganebashi Bridge.

Secondly, if you are going to visit Nagasaki in early October of 2025, you will be impressed by the grand autumn festival, the Nagasaki Kunchi, which is held from October 7th to 9th every year. In places such as the Suwa Shrine, Chuo-Park, Yasaka Shrine, and Otabisho, you can witness various performances like Japanese folk dance, the dragon dance originating from China, as well as Dutch comedies. As a reminder, you need to buy tickets in advance since these venues are designated as paid seating sections. Non-payment areas are available as well though, they are more crowded.

Worship Activities in Suwa Shrine

What to Wear for Nagasaki Trip in October

Clothes

At the very beginning of October, the weather is warm around mid-day, so you can wear a summer T-shirt on the top. In the morning and after sunset, the temperature is lower, and you’d better add a long-sleeved shirt or a thin coat outside. As for the bottom, you are recommended to wear a thin summer long pants.

During the middle and late periods of the month, the temperature drops further. To keep warm, you can wear a hoodie with light lining or a long-sleeved top plus a thin cardigan. Jeans or casual sweatpants are OK for the bottom part.

Shoes
It is more suitable for you to wear light and comfortable shoes that are anti-slip, such as the casual sneakers, because there are many slopes in some well-known attractions like the Glover Garden and the Oura Cathedral.

Others

Wearing a cap will make it more comfortable for you to walk in sunny weather. If you are sensitive to cold, you can wear a silk scarf or a shawl. This will not only keep you warm but also enhance your overall look.

Travel Recommendation & Tips

Night View of Mount Inasa in October

As sunset is earlier in October, you don’t have to wait for too long to see the beautiful sunset in the Mount Inasa where you can also enjoy a panoramic view of the splendid night scene of Nagasaki city.

The precipitation in October is relatively less frequent, but rainfalls should still be taken seriously. Therefore, it’s always right to bring an umbrella.

It’s easy to catch a cold as the temperature drops, so you are advised to bring some cold medicine.

Don’t forget to reserve your flight tickets or accommodation in advance if you decide to visit Nagasaki in early October during the Nagasaki Kunchi.