When to go · Cook Islands

Cook Islands in September

Great month. Dry and calm; whales.

Key facts

Plan around it

Verdict

GreatVoykit month rating for Cook Islands

Dry and calm; whales.

No other month rates higher than September for Cook Islands in this guide.

Southern Cooks · Rarotonga, Aitutaki, Atiu, Mangaiabest weather
May–October is drier and cooler (lows around 18 °C (64 °F)); December–March is humid, with heavy rain and cyclone risk, worst in February–March.May–October is drier and cooler (lows around 64 °F (18 °C)); December–March is humid, with heavy rain and cyclone risk, worst in February–March.
Northern atolls · Penrhyn, Manihiki, Pukapukafine
Hot all year near the equator; access by rare flights or cargo ship only.
Avarua26 °C (79 °F) / 19 °C (66 °F), 8 rain days79 °F (26 °C) / 66 °F (19 °C), 8 rain days
Aitutaki26 °C (79 °F) / 21 °C (70 °F), 8 rain days79 °F (26 °C) / 70 °F (21 °C), 8 rain days
Mitiaro27 °C (81 °F) / 21 °C (70 °F), 7 rain days81 °F (27 °C) / 70 °F (21 °C), 7 rain days
Palmerston Island25 °C (77 °F) / 20 °C (68 °F), 8 rain days77 °F (25 °C) / 68 °F (20 °C), 8 rain days

Weather, crowds and prices for any two months in Cook Islands, side by side.

First month

Second month

September: Dry and calm; whales.

May: Dry season begins; good value.

Cook Islands: figures are long-term averages from this guide, not a forecast.

Nothing unusual for the weather this month.