The best time to visit the Cook Islands is between April and November, during the driest months, when temperatures are warm but still pleasant when you’re exploring.
The climate in the islands is tropical and generally agreeable, with steady humidity levels and temperatures between 24°C and 30°C. But Rarotonga’s richly green mountainous heart attests to the fact rainfall is possible all year round on the Cooks.
December to March is the damp season, when there’s a greater chance of cloudy days and the occasional storm. In reality, this means it’s likely to rain hard for a couple of hours and then stop — so travel isn’t impossible at this time of year. You’d be very unlucky to have rain for days on end. Temperatures hover around 26°C to 30°C.
Month-by-month guide for travelling in the Cook Islands
Visiting the Cook Islands in January - February
The middle of the Cook Islands’ summer, these months are not only the hottest but also the most prone to heavy rainfall, although continuous days of solid rain are rare. There’s also a (low) risk of cyclones.
Visiting the Cook Islands in March - April
March sees the tail end of the Cooks’ rainy season. From April, the weather settles and the islands become pleasantly warm, the humidity occasionally punctured by the odd refreshing shower or sea breeze.
Events & Festivals
- Te Mare Ura, a festival of the Cook Islands’ traditional Mare Ura dance, takes place annually in Rarotonga between April and May.
Visiting the Cook Islands in May - June
May and June see the islands becoming warmer still, and steadily busier as tourists from around the world (but especially the Southern Hemisphere) start to visit. Whale-watching season begins mid-June and runs until October. At these times of year, you can see humpbacks blowholing from the shore on the western side of Rarotonga.
Events & Festivals
- Te Mare Ura, a festival of the Cook Islands’ traditional Mare Ura dance, takes place annually in Rarotonga between April and May.
Visiting the Cook Islands in July - August
This is the middle of the Cooks’ winter. Daytime temperatures are warm, while the nights can be chilly. It’s also when the Cooks are at their busiest, as Australians and New Zealanders flock to the islands during their school winter breaks.
Events & Festivals
- Manureva Aquafest, a water sports festival showcasing some of the world’s best kitesurfers, comes to Aitutaki in late August.
Visiting the Cook Islands in September - November
In September, the weather is still warm, but a thicker, soupier humidity returns to the islands by November. It’s still possible to see whales until mid-October, but we recommend avoiding the last week of September as this often coincides with spring break for New Zealanders.
Events & Festivals
- Mire Tiare, the Cooks’ flower festival, is celebrated on Rarotonga in late November.
- Vaka Eiva (a prestigious canoe-racing competition) also takes place in late November in Avarua.
Visiting the Cook Islands in December
In December, the heat ramps up, more frequent rainfall envelops the Cooks, and there’s a greater chance of inclement weather and storms.
Cook Islands Climate Guide
| Destination | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Aitutaki | 30°C 245mm | 30°C 237mm | 30°C 212mm | 30°C 219mm | 28°C 181mm | 28°C 93mm | 27°C 80mm | 25°C 90mm | 27°C 90mm | 28°C 123mm | 29°C 162mm | 29°C 227mm |
| Rarotonga | 28°C 249mm | 28°C 241mm | 28°C 216mm | 27°C 299mm | 25°C 211mm | 24°C 144mm | 24°C 126mm | 24°C 165mm | 25°C 163mm | 25°C 128mm | 26°C 190mm | 27°C 286mm |
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Travel advice
Practical tips for travelling to the Cook Islands, from social protocols to guidance on money matters, with a link to the latest FCDO travel advice.
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