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Dejima

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Top 10 things to do in Dejima

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Best time to visit Dejima

Data source：Meteostat
Last updated：2025-09

Weather in Dejima throughout the year

  • Spring (March–May): Average 12.8–19.9°C, mild climate but with relatively high rainfall, especially in March and April. Common activities: Flower viewing, outdoor excursions (bring an umbrella or raincoat). Recommended clothing: Light jacket, long-sleeved shirt, umbrella or raincoat.
  • Summer (June–August): Average 23.6–29.2°C, hot and humid with heavy rainfall, most rainfall in June. Common activities: Beach activities, trips to summer resorts. Recommended clothing: Light and breathable clothing, sun hat, sunscreen.
  • Autumn (September–November): Average 16.0–27.1°C, comfortable temperatures, rainfall gradually decreases. Common activities: Hiking, maple leaf viewing (depending on tree species). Recommended clothing: Light jacket, long-sleeved shirt.
  • Winter (December–February): Average 7.6–9.0°C, low temperatures, dry and little rain. Common activities: Hot spring bathing, indoor activities. Recommended clothing: Warm jacket, sweater, scarf, gloves.

Weather in Dejima

Annual average temperature: approx. 18°C / Annual rainfall: approx. 2007 mm / Summer humidity: 70%–80% / Rainiest month: June

Dejima weather by month

Month
Temperature (°C)
Rainfall (mm)
January
7.6°C
93
February
8.8°C
86.3
March
12.8°C
212
April
17°C
194.7
May
19.9°C
207
June
23.6°C
324.7
July
28.1°C
282.3
August
29.2°C
243.7
September
27.1°C
165.3
October
20.8°C
69
November
16°C
85.7
December
9°C
43.3

7-day weather forecast for Dejima

11/6
Friday
Sunny
19.6°C/15.2°C
11/7
Saturday
Sunny
14.9°C/11.9°C
11/8
Sunday
Overcast
16.3°C/11.7°C
11/9
Monday
Overcast
15.9°C/13.6°C
11/10
Tuesday
Overcast
18.4°C/14°C
11/11
Wednesday
Sunny
17.7°C/13°C
11/12
Thursday
Overcast
18.5°C/14°C

Dejima travel FAQs and useful info

Does Dejima still exist as an island trading post?

Dejima no longer exists as an island trading post, but its former buildings have been faithfully restored based on extensive research. Catch a glimpse of the city as it was at the beginning of the nineteenth century through restored residences, storehouses, and artifacts on display.

Is Dejima worth visiting for history enthusiasts?

If you like history or museums this is a must visit. Dejima is the only artificial island allowed to interact with other countries during the national isolation period of the Edo period, and is a nationally designated historic site representing Nagasaki.

What was the original purpose of constructing Dejima?

To prevent the spread of Christianity, the Tokugawa Shogunate built an off-shore island called Dejima to intern Portuguese residents living freely in Nagasaki. The island was completed in 1636 through the investment of 25 leading Nagasaki merchants.

When did the Dutch trading activities at Dejima conclude?

Dejima served as a trading post for the Dutch from 1641 to 1858.

What can visitors see at the restored Dejima today?

Visitors can explore faithfully restored historical buildings, including residences and storehouses, which offer a vivid look into Nagasaki's past during the Edo period. Artifacts on display provide further insight into the island's unique history.