Average monthly water temperature in Nagasaki, Japan
On this page you find the mean water temperature over the year in Nagasaki (Nagasaki), Japan. Understand how water temperatures vary throughout the year.
In Nagasaki, the water undergoes seasonal changes. The warmest month is August, with an average water temperature of 27°C (81°F).
The coldest water temperature month, February, has an average temperature of 14°C (57°F). It may not be the ideal time for a swim.
Nagasaki Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Nagasaki - and find the best time to visit.
Nagasaki 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Nagasaki climate overview or explore weather in Japan.
Popular this month
Where to go in July - average daytime high across popular destinations.
Osaka
32°C (90°F) Tokyo30°C (86°F) Naha
30°C (86°F) Kyoto31°C (88°F) Hakone28°C (82°F) Hakuba26°C (79°F) Sapporo24°C (75°F) Niseko24°C (75°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Chase the autumn leaves in Japan
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The famous bamboo forests of Arashiyama
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Here are 10 reasons why you should plan a winter trip to Japan. During this period, popular sights are less busy and prices for flights and hotels much cheaper.