The Cook Islands weather is typically tropical. Summer, between December and April, is hotter and more humid with a higher rainfall and the risk of tropical storms. Winter is between May and November and is cooler and drier. Aitutaki and the northern islands are noticeably warmer than the main island of Rarotonga. Rarotonga is a volcanic island and accumulates cloud around its mountain peaks. Mangaia in the south is the coolest island and a light sweater may be needed at nights and early mornings.

Summer - December to April
The summer rainy season begins in December and lasts until April. During this time it can become hot and humid (29C by day) with bright sunny mornings and late afternoon downpours around Rarotonga. As the heat accumulates over the Pacific Ocean during this season, depressions can form bringing with them torrential downpours, strong winds and the occasional tropical cyclone. This 'rainy season' is a good time to come to experience the lush vibrancy of the countryside. The down side is high humidity, sticky nights and more mosquitoes.

Winter - May to October
By midwinter in July the average daily temperature is a very pleasant 25C. Temperatures become pleasantly cool at night (19C) and a light jumper may be necessary in the evenings and early mornings.

	Rarotonga
	Temp (C)	Sun (hrs. / day)	Rainfall (cm / month)
Nov - Apr (summer)	29 / 21	6.1	230
May - Oct (winter)	25 / 19	6.0	123

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