Average monthly water temperature in Isahaya, Japan
On this page you find the mean water temperature over the year in Isahaya (Nagasaki), Japan. Take a closer look at the water temperature patterns and what they mean for swimming and recreation.
Water temperatures in Isahaya fluctuate across the seasons. The warmest month, August, averages 27°C (81°F).
The coldest water temperature month is February, averaging 14°C (57°F). Seasonal shifts offer opportunities to explore different activities depending on the time of year.
Isahaya Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Isahaya - and find the best time to visit.
Isahaya 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Isahaya climate overview or explore weather in Japan.
Popular this month
Where to go in August - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
Walk the 88 temple circuit
We recommend walking the 88 temple circuit from April til October. Although June, July and August can be a bit wet, hot and humid.
The famous bamboo forests of Arashiyama
The famous bamboo forests of Arashiyama lie just outside the city center of Kyoto and is unique in the world. If you look at photos of this bamboo forest, it looks like you have landed in a fairy-tale world.
10 reasons why you should visit Japan in winter
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.