Yonaguni weather by month & the best time to visit
Japan · beach resort · tropical monsoon climate
The best time to visit Yonaguni is February — its sunniest month (Sunshine Score 78/100), with January and December close behind. Yonaguni averages about 1,466 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 47 mm of rain in February.
When is the best time to visit Yonaguni?
For sunshine, the best time to visit Yonaguni is February, then January and December. The dullest month is May (59/100, 181 mm of rain). The full month-by-month picture is in the table below.
How sunny is Yonaguni?
Yonaguni isn't a sunny place by world standards: about 1,466 hours of sunshine a year. February (78/100) is noticeably better than May (59). It ranks #74 of 79 destinations in Japan for annual sunshine, below the national median of 1,773 hours. The year's 1,491 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 | 76 | 21° / 70°F | 19° / 66°F | 58 mm | 4 | 25° / 77°F |
| February | 78 | 21° / 70°F | 20° / 68°F | 47 mm | 5 | 25° / 77°F |
| March | 73 | 22° / 72°F | 21° / 70°F | 75 mm | 5 | 24° / 75°F |
| April | 68 | 24° / 75°F | 23° / 73°F | 104 mm | 6 | 28° / 82°F |
| May | 59 | 27° / 81°F | 25° / 77°F | 181 mm | 8 | 28° / 82°F |
| June | 59 | 28° / 82°F | 28° / 82°F | 206 mm | 9 | 30° / 86°F |
| July | 61 | 29° / 84°F | 29° / 84°F | 143 mm | 11 | 31° / 88°F |
| August | 59 | 29° / 84°F | 29° / 84°F | 215 mm | 10 | 31° / 88°F |
| September | 59 | 29° / 84°F | 28° / 82°F | 206 mm | 9 | 30° / 86°F |
| October | 69 | 27° / 81°F | 26° / 79°F | 99 mm | 6 | 29° / 84°F |
| November | 70 | 25° / 77°F | 24° / 75°F | 92 mm | 5 | 27° / 81°F |
| December | 75 | 22° / 72°F | 21° / 70°F | 65 mm | 3 | 26° / 79°F |
Sea temperature in Yonaguni by month
The sea off Yonaguni is warmest in July at around 31°C / 88°F, and coolest in March at 24°C / 75°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
Yonaguni: questions and answers
What kind of destination is Yonaguni?
Yonaguni is a beach resort in Japan with a tropical monsoon climate — the sea reaches 31°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does Yonaguni get a year?
Yonaguni gets about 1,466 hours of sunshine a year, at its best around February.
When is the best time to visit Yonaguni?
The sunniest time to visit Yonaguni is February, when the Sunshine Score peaks at 78/100 (with January and December close behind). Expect daytime highs around 21°C / 70°F.
What is the least sunny month in Yonaguni?
May is the least sunny month in Yonaguni, scoring 59/100 with about 181 mm of rain.
What is the sea temperature in Yonaguni?
The sea in Yonaguni ranges from about 24°C (March) to 31°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Yonaguni?
The typical midday UV index in Yonaguni peaks around 11 (extreme) in July, easing to about 3 (moderate) in December. Month-by-month midday UV values are in the UV column of the table on this page.
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