Yakushima weather by month & the best time to visit
Japan · beach resort · humid subtropical climate
The best time to visit Yakushima is April — its sunniest month (Sunshine Score 61/100), with May and June close behind. Yakushima averages about 1,647 hours of sunshine a year. Daytime highs around 20°C / 68°F and roughly 220 mm of rain in April.
When is the best time to visit Yakushima?
For sunshine, the best time to visit Yakushima is April, then May and June. The dullest month is January (37/100, 137 mm of rain). The full month-by-month picture is in the table below.
How sunny is Yakushima?
Yakushima isn't a sunny place by world standards: about 1,647 hours of sunshine a year. April (61/100) is noticeably better than January (37). It ranks #57 of 79 destinations in Japan for annual sunshine, below the national median of 1,773 hours. Rain has a clear season: the wettest stretch, around June, carries about 41% of the annual 2,982 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 37 | 15° / 59°F | 13° / 55°F | 137 mm | 3 | 23° / 73°F |
| February | 40 | 16° / 61°F | 13° / 55°F | 160 mm | 4 | 22° / 72°F |
| March | 50 | 18° / 64°F | 15° / 59°F | 196 mm | 5 | 22° / 72°F |
| April | 61 | 20° / 68°F | 18° / 64°F | 220 mm | 6 | 22° / 72°F |
| May | 61 | 23° / 73°F | 21° / 70°F | 277 mm | 7 | 25° / 77°F |
| June | 61 | 25° / 77°F | 24° / 75°F | 588 mm | 6 | 27° / 81°F |
| July | 61 | 28° / 82°F | 27° / 81°F | 352 mm | 9 | 30° / 86°F |
| August | 61 | 29° / 84°F | 28° / 82°F | 219 mm | 9 | 31° / 88°F |
| September | 61 | 28° / 82°F | 27° / 81°F | 310 mm | 7 | 30° / 86°F |
| October | 61 | 25° / 77°F | 23° / 73°F | 201 mm | 6 | 28° / 82°F |
| November | 61 | 21° / 70°F | 19° / 66°F | 170 mm | 4 | 26° / 79°F |
| December | 45 | 17° / 63°F | 15° / 59°F | 152 mm | 3 | 23° / 73°F |
Sea temperature in Yakushima by month
The sea off Yakushima is warmest in August at around 31°C / 88°F, and coolest in February at 22°C / 72°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Yakushima: questions and answers
What kind of destination is Yakushima?
Yakushima is a beach resort in Japan with a humid subtropical climate — the sea reaches 31°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does Yakushima get a year?
Yakushima gets about 1,647 hours of sunshine a year, at its best around April.
When is the best time to visit Yakushima?
The sunniest time to visit Yakushima is April, when the Sunshine Score peaks at 61/100 (with May and June close behind). Expect daytime highs around 20°C / 68°F.
What is the least sunny month in Yakushima?
January is the least sunny month in Yakushima, scoring 37/100 with about 137 mm of rain.
What is the sea temperature in Yakushima?
The sea in Yakushima ranges from about 22°C (February) to 31°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Yakushima?
The typical midday UV index in Yakushima peaks around 9 (very high) in July, easing to about 3 (moderate) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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