The climate of the Cook Islands can be described as warm, tropical climate. Temperatures are warm all year round and can get hot in the summer but seldom reaches above 35°C. Trade winds from the east-southeast bring year long cooling breezes late afternoon and early evening.
The tropical rain season is from December to February coinciding with the warmest summer months. The Cook Islands are situated in the southern Hemisphere, so "Summer" lasts from November to February and "Winter" from April to September. However, there are no significant differences in temperature; in general, the temperatures between April and September are only slightly cooler than from November to February.
Typhoons can sometimes hit the cook Islands from end January to mid March. However, these storms are mostly not a danger for the Islands, because the usual routes of these storms are often too far south in the southern hemisphere Typhoon season, and not every Typhoon that hit the Cook Islands is a strong one.
Lightweight cotton clothing is advised throughout the year, with an umbrella or raincoat for sudden cloudbursts. No matter where you go, be prepared for high temperatures and humidity.
The Climate of the Cook Islands can be classified as Af climate, a hot, humid tropical climate with all months above 18°C.