Hachijojima weather by month & the best time to visit
Japan · beach resort · humid subtropical climate
The best time to visit Hachijojima is August — its sunniest month (Sunshine Score 64/100), with November and May close behind. Hachijojima averages about 1,827 hours of sunshine a year. Daytime highs around 28°C / 82°F and roughly 140 mm of rain in August.
When is the best time to visit Hachijojima?
For sunshine, the best time to visit Hachijojima is August, then November and May. The dullest month is January (42/100, 90 mm of rain). The full month-by-month picture is in the table below.
How sunny is Hachijojima?
Hachijojima gets a moderate 1,827 hours of sunshine a year. August (64/100) is noticeably better than January (42). It ranks #28 of 79 destinations in Japan for annual sunshine, above the national median of 1,773 hours. The year's 1,960 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 42 | 15° / 59°F | 12° / 54°F | 90 mm | 2 | 21° / 70°F |
| February | 42 | 15° / 59°F | 12° / 54°F | 96 mm | 3 | 20° / 68°F |
| March | 43 | 16° / 61°F | 14° / 57°F | 137 mm | 5 | 20° / 68°F |
| April | 51 | 18° / 64°F | 16° / 61°F | 157 mm | 6 | 21° / 70°F |
| May | 62 | 21° / 70°F | 19° / 66°F | 205 mm | 7 | 23° / 73°F |
| June | 62 | 23° / 73°F | 22° / 72°F | 276 mm | 7 | 25° / 77°F |
| July | 62 | 26° / 79°F | 25° / 77°F | 175 mm | 8 | 28° / 82°F |
| August | 64 | 28° / 82°F | 27° / 81°F | 140 mm | 9 | 29° / 84°F |
| September | 62 | 27° / 81°F | 26° / 79°F | 214 mm | 7 | 29° / 84°F |
| October | 62 | 24° / 75°F | 23° / 73°F | 217 mm | 5 | 28° / 82°F |
| November | 63 | 21° / 70°F | 19° / 66°F | 142 mm | 3 | 25° / 77°F |
| December | 52 | 17° / 63°F | 15° / 59°F | 111 mm | 2 | 22° / 72°F |
Sea temperature in Hachijojima by month
The sea off Hachijojima is warmest in August at around 29°C / 84°F, and coolest in February at 20°C / 68°F. The water sits at a comfortable 21°C or warmer roughly 10 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Hachijojima: questions and answers
What kind of destination is Hachijojima?
Hachijojima is a beach resort in Japan with a humid subtropical climate — the sea reaches 29°C at its warmest and is swimmable (21°C+) about 10 months a year.
How many hours of sunshine does Hachijojima get a year?
Hachijojima gets about 1,827 hours of sunshine a year, at its best around August.
When is the best time to visit Hachijojima?
The sunniest time to visit Hachijojima is August, when the Sunshine Score peaks at 64/100 (with November and May close behind). Expect daytime highs around 28°C / 82°F.
What is the least sunny month in Hachijojima?
January is the least sunny month in Hachijojima, scoring 42/100 with about 90 mm of rain.
What is the sea temperature in Hachijojima?
The sea in Hachijojima ranges from about 20°C (February) to 29°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Hachijojima?
The typical midday UV index in Hachijojima peaks around 9 (very high) in August, easing to about 2 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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