When to Visit Cook Islands
Climate guide & best times to travel
Best Time to Visit
Recommended timing for different travel styles.
What to Pack
Essentials and seasonal recommendations for Cook Islands.
Interactive checklist with shopping links for every item you need.
View Cook Islands Packing List →Month-by-Month Guide
Climate conditions and crowd levels for each month of the year.
January sits at the wet season's core. Highs reach 28°C (83°F). Lows hold around 23°C (73°F). Rarotonga averages about 257 mm of rainfall. The year's highest. Humidity hits 81 percent. The UV index peaks at 15 on clear days. The sun between showers burns fast. Pack serious protection.
February mirrors January closely. Highs nudge to 29°C (84°F). Lows stay at 23°C (73°F). Rainfall eases slightly to around 229 mm. Regular afternoon downpours continue. Humidity hovers around 80 percent. Peak UV remains at 15. Cyclone season continues. Direct strikes on the Cook Islands stay relatively uncommon.
March marks the wet season's tail end. Highs hold at 29°C (84°F). Lows stay at 23°C (73°F). Rainfall drops to about 218 mm. Humidity edges down to 79 percent. Peak UV eases to 13. Still intense. Noticeably less punishing. Lagoon water hits its warmest. Snorkeling stays excellent. Skies cooperate less reliably.
April keeps you guessing. Highs settle to 28°C (82°F). Lows drop to 22°C (72°F). Rainfall ticks up slightly to around 246 mm. One of the wetter months despite approaching the dry season. Humidity is 78 percent. Peak UV is 10. Brilliant days happen. Stubborn cloud cover does too.
May brings a noticeable shift. Highs drop to 26°C (79°F). Lows fall to 21°C (69°F). Rainfall decreases to about 198 mm. Humidity holds at 80 percent. The trade winds strengthen. Comfort returns. Peak UV drops to 7. Crowds thin. Conditions improve. A genuine shoulder month.
June locks in the dry season. Rarotonga highs reach 25°C (77°F). Lows sit at 20°C (68°F). Almost crisp by tropical standards. Evenings cool noticeably. Rainfall falls sharply to about 127 mm. Humidity drops to 73 percent. Peak UV is 6. The air feels fresh. Hiking and interior exploring become far more appealing.
July is typically the driest and coolest month. Highs of 24°C (76°F). Lows of 19°C (66°F). Rarotonga sees only about 112 mm of rain. Humidity stays at 74 percent. Peak UV is 6. Pack a light layer for evenings. Strange advice this close to the equator. Te Maeva Nui celebrations make this one of the most culturally rewarding times to visit.
August mirrors July closely. Highs hit 24°C (76°F), lows settle at 19°C (67°F). Rain edges up to 142 mm. Yet Rarotonga remains firmly dry. Humidity holds at 73 percent. Peak UV returns to 8. Whales arrive. Humpbacks move through Cook Islands waters now, following ancient migration paths.
September brings warmth back. Rarotonga tops out at 25°C (78°F), bottoms at 19°C (67°F). Rain stays reasonable at 137 mm. Humidity hits 76 percent. Peak UV jumps to 10. Summer nears. Water clarity shines this month. Snorkeling and diving around Aitutaki reach prime conditions.
October flies under the radar. Smart travelers pay attention. Rarotonga sees 26°C (79°F) highs, 20°C (69°F) lows. Rainfall bottoms at 122 mm annually. Humidity sits at 75 percent. Peak UV hits 12. Weather stays consistent. Crowds thin. Rooms open up. Flexible planners should circle this month.
November shifts gears slowly. Rarotonga reaches 27°C (80°F) highs, 21°C (71°F) lows. Rain spikes to 170 mm. Humidity climbs to 76 percent. Peak UV hits 13. Afternoons cloud over. Downpours come. Mornings stay clear. Cyclone season opens officially. Direct hits on the Cook Islands remain uncommon.
December builds toward peak heat. Highs reach 28°C (82°F), lows 22°C (72°F). Rain surges to 246 mm in Rarotonga, tying April as wettest. Humidity peaks at 81 percent. UV maxes at 14. Holiday visitors flood in. New Zealanders and Australians dominate. This stretch alone feels crowded.
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