Kumejima weather by month & the best time to visit
Japan · beach resort · tropical monsoon climate
The best time to visit Kumejima is February — its sunniest month (Sunshine Score 79/100), with December and November close behind. Kumejima averages about 1,729 hours of sunshine a year. Daytime highs around 20°C / 68°F and roughly 52 mm of rain in February.
When is the best time to visit Kumejima?
For sunshine, the best time to visit Kumejima is February, then December and November. The dullest month is May (61/100, 214 mm of rain). The full month-by-month picture is in the table below.
How sunny is Kumejima?
Kumejima isn't a sunny place by world standards: about 1,729 hours of sunshine a year. February (79/100) is noticeably better than May (61). It ranks #46 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 May, carries about 41% of the annual 1,616 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 70 | 19° / 66°F | 17° / 63°F | 65 mm | 4 | 24° / 75°F |
| February | 79 | 20° / 68°F | 18° / 64°F | 52 mm | 5 | 23° / 73°F |
| March | 72 | 21° / 70°F | 19° / 66°F | 90 mm | 6 | 23° / 73°F |
| April | 64 | 23° / 73°F | 21° / 70°F | 135 mm | 7 | 25° / 77°F |
| May | 61 | 25° / 77°F | 24° / 75°F | 214 mm | 7 | 27° / 81°F |
| June | 61 | 27° / 81°F | 27° / 81°F | 306 mm | 9 | 28° / 82°F |
| July | 64 | 29° / 84°F | 28° / 82°F | 133 mm | 11 | 31° / 88°F |
| August | 61 | 29° / 84°F | 29° / 84°F | 172 mm | 10 | 31° / 88°F |
| September | 61 | 29° / 84°F | 28° / 82°F | 184 mm | 9 | 30° / 86°F |
| October | 67 | 26° / 79°F | 25° / 77°F | 119 mm | 7 | 29° / 84°F |
| November | 74 | 24° / 75°F | 23° / 73°F | 81 mm | 5 | 27° / 81°F |
| December | 77 | 21° / 70°F | 19° / 66°F | 65 mm | 3 | 25° / 77°F |
Sea temperature in Kumejima by month
The sea off Kumejima is warmest in July at around 31°C / 88°F, and coolest in February at 23°C / 73°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
Kumejima: questions and answers
What kind of destination is Kumejima?
Kumejima 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 Kumejima get a year?
Kumejima gets about 1,729 hours of sunshine a year, at its best around February.
When is the best time to visit Kumejima?
The sunniest time to visit Kumejima is February, when the Sunshine Score peaks at 79/100 (with December and November close behind). Expect daytime highs around 20°C / 68°F.
What is the least sunny month in Kumejima?
May is the least sunny month in Kumejima, scoring 61/100 with about 214 mm of rain.
What is the sea temperature in Kumejima?
The sea in Kumejima ranges from about 23°C (February) to 31°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Kumejima?
The typical midday UV index in Kumejima 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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