Okinoshima weather by month & the best time to visit
Japan · beach resort · humid subtropical climate
The best time to visit Okinoshima is August — its sunniest month (Sunshine Score 64/100), with October and June close behind. Okinoshima averages about 1,674 hours of sunshine a year. Daytime highs around 27°C / 81°F and roughly 130 mm of rain in August.
When is the best time to visit Okinoshima?
For sunshine, the best time to visit Okinoshima is August, then October and June. The dullest month is January (0/100, 142 mm of rain). The full month-by-month picture is in the table below.
How sunny is Okinoshima?
Okinoshima isn't a sunny place by world standards: about 1,674 hours of sunshine a year. 64 Sunshine Score points separate August (64) from January (0), so the month you pick matters. It ranks #51 of 79 destinations in Japan for annual sunshine, below the national median of 1,773 hours. The year's 1,728 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 | 0 | 8° / 46°F | 6° / 43°F | 142 mm | 1 | 15° / 59°F |
| February | 0 | 8° / 46°F | 6° / 43°F | 111 mm | 2 | 14° / 57°F |
| March | 16 | 11° / 52°F | 8° / 46°F | 122 mm | 4 | 13° / 55°F |
| April | 33 | 14° / 57°F | 11° / 52°F | 117 mm | 5 | 15° / 59°F |
| May | 54 | 18° / 64°F | 15° / 59°F | 130 mm | 6 | 18° / 64°F |
| June | 61 | 21° / 70°F | 19° / 66°F | 159 mm | 6 | 22° / 72°F |
| July | 61 | 25° / 77°F | 23° / 73°F | 205 mm | 7 | 24° / 75°F |
| August | 64 | 27° / 81°F | 25° / 77°F | 130 mm | 7 | 29° / 84°F |
| September | 61 | 24° / 75°F | 23° / 73°F | 206 mm | 6 | 28° / 82°F |
| October | 64 | 20° / 68°F | 18° / 64°F | 131 mm | 4 | 24° / 75°F |
| November | 45 | 16° / 61°F | 13° / 55°F | 114 mm | 2 | 20° / 68°F |
| December | 15 | 11° / 52°F | 8° / 46°F | 161 mm | 1 | 17° / 63°F |
Sea temperature in Okinoshima by month
The sea off Okinoshima is warmest in August at around 29°C / 84°F, and coolest in March at 13°C / 55°F. The water sits at a comfortable 21°C or warmer roughly 5 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Okinoshima: questions and answers
What kind of destination is Okinoshima?
Okinoshima 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 5 months a year.
How many hours of sunshine does Okinoshima get a year?
Okinoshima gets about 1,674 hours of sunshine a year, at its best around August.
When is the best time to visit Okinoshima?
The sunniest time to visit Okinoshima is August, when the Sunshine Score peaks at 64/100 (with October and June close behind). Expect daytime highs around 27°C / 81°F.
What is the least sunny month in Okinoshima?
January is the least sunny month in Okinoshima, scoring 0/100 with about 142 mm of rain.
What is the sea temperature in Okinoshima?
The sea in Okinoshima ranges from about 13°C (March) to 29°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Okinoshima?
The typical midday UV index in Okinoshima peaks around 7 (high) in July, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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