Atiu Island weather by month & the best time to visit
Cook Islands · beach resort · tropical monsoon climate
The best time to visit Atiu Island is June — its sunniest month (Sunshine Score 84/100), with August and July close behind. Atiu Island averages about 2,715 hours of sunshine a year. Daytime highs around 25°C / 77°F and roughly 58 mm of rain in June.
When is the best time to visit Atiu Island?
For sunshine, the best time to visit Atiu Island is June, then August and July. The dullest month is January (67/100, 210 mm of rain). The full month-by-month picture is in the table below.
How sunny is Atiu Island?
Atiu Island gets a lot of sun: around 2,715 hours a year. June (84/100) is noticeably better than January (67). It ranks #4 of 6 destinations in Cook Islands for annual sunshine, below the national median of 2,719 hours. The year's 1,613 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 | 67 | 27° / 81°F | 26° / 79°F | 210 mm | 12 | 27° / 81°F |
| February | 67 | 27° / 81°F | 27° / 81°F | 217 mm | 12 | 29° / 84°F |
| March | 67 | 27° / 81°F | 27° / 81°F | 172 mm | 11 | 29° / 84°F |
| April | 67 | 27° / 81°F | 26° / 79°F | 166 mm | 9 | 28° / 82°F |
| May | 70 | 26° / 79°F | 25° / 77°F | 138 mm | 7 | 28° / 82°F |
| June | 84 | 25° / 77°F | 24° / 75°F | 58 mm | 6 | 26° / 79°F |
| July | 82 | 24° / 75°F | 24° / 75°F | 69 mm | 7 | 25° / 77°F |
| August | 83 | 24° / 75°F | 23° / 73°F | 65 mm | 8 | 25° / 77°F |
| September | 82 | 24° / 75°F | 24° / 75°F | 71 mm | 10 | 25° / 77°F |
| October | 78 | 25° / 77°F | 24° / 75°F | 93 mm | 11 | 26° / 79°F |
| November | 67 | 26° / 79°F | 25° / 77°F | 150 mm | 11 | 26° / 79°F |
| December | 67 | 26° / 79°F | 26° / 79°F | 204 mm | 12 | 27° / 81°F |
Sea temperature in Atiu Island by month
The sea off Atiu Island is warmest in February at around 29°C / 84°F, and coolest in July at 25°C / 77°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
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Atiu Island: questions and answers
What kind of destination is Atiu Island?
Atiu Island is a beach resort in Cook Islands with a tropical monsoon climate — the sea reaches 29°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does Atiu Island get a year?
Atiu Island gets about 2,715 hours of sunshine a year, at its best around June.
When is the best time to visit Atiu Island?
The sunniest time to visit Atiu Island is June, when the Sunshine Score peaks at 84/100 (with August and July close behind). Expect daytime highs around 25°C / 77°F.
What is the least sunny month in Atiu Island?
January is the least sunny month in Atiu Island, scoring 67/100 with about 210 mm of rain.
What is the sea temperature in Atiu Island?
The sea in Atiu Island ranges from about 25°C (July) to 29°C (February). Month-by-month sea temperatures are on this page.
How strong is the sun in Atiu Island?
The typical midday UV index in Atiu Island peaks around 12 (extreme) in January, easing to about 6 (high) in June. Month-by-month midday UV values are in the UV column of the table on this page.
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