Cook Islands climate guide: monthly weather averages

The Cook Islands climate guides are perfect for planning your holiday. Monthly weather averages give the best indication of what the weather is usually like for every month of the year including figures for temperature, rainfall and sunshine. The climate guide shown below is for Avarua.

Temperature in Cook Islands (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
Min temperature (night-time)
Sea temperature

Sunshine & Daylight in Cook Islands

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of daylight

Rainfall in Cook Islands

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
Average monthly rainfall (mm)

More climate for Cook Islands

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
Heat & Humidity

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Metric (°C / mm)  |  Imperial (°F / inches)

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Cook Islands climate overview

The Cook Islands are part of Polynesia, lying almost exactly in the centre of the South Pacific between Tonga and French Polynesia. The indigenous people are Maoris known for their vibrant culture and energetic dances. The 15 islands form a northern and southern group separated by over 800 kilometres (500 miles) of ocean.

The northern group of islands are coral atolls, which are mostly flat and low lying. Because of human occupation none of the original native vegetation of the islands remains. Today coconut palms and pandanus trees grow along the picture-perfect sandy beaches, graced by scenic lagoons.

The southern island group is volcanic in origin. The largest island is Rarotonga, whose rugged mountainous interior is covered in lush jungle, cleared in parts for citrus groves to thrive on the fertile soils. Near the south coast is the stunning Wigmore's Waterfall, while the capital Avarua lies on the north shore.

Coastal resorts have been developed to take advantage of the picturesque sandy beaches, however the most beautiful beaches and lagoons are found on Aitutaki 250 kms (160 miles) to the north.

Coral reefs surround almost all of the islands, creating a sheltered haven of turquoise water, teeming with tropical marine life and bathed in warm water all year.

The climate is warm tropical and wet. Rainfall is likely in all months, becoming heaviest from January to March and more isolated in the sunnier drier season. Daytime temperatures are warm throughout the year, falling to comfortable at night in the drier months.

Tropical Cyclones are possible between December and March but are rare.

Cook Islands climate by month

Check Cook Islands climate for a particular month by selecting from the list below. Monthly climate guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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