The maximum temperature in Yakushima is on average 22°C over the year, with values generally ranging between 15°C in January and 29°C in August. The climate is very wet, with about 3,204 mm of precipitation per year. The monthly minimum is 164 mm in January and the maximum reaches 607 mm in June.
The climate is suitable for a trip to Yakushima in: January, February, March, April, May, July, August, September, October, November and December. Nevertheless, the months when the weather is really pleasant are February, March, April, May, August, November and December.
For swimming, the most favorable period for water temperature is July, August and September, with a water temperature above 26.4°C.
However, the best time to fully enjoy the beach and swimming is April, May, August and October.
For scuba diving and snorkeling, the best months are April, May, August, October and November.
For hiking and trekking, the best months are March, April, May, October and November.
In terms of crowd levels, the quietest periods are in January, while crowding is high in April, May, July, September, October and August.
