Climate & Weather Guide in Cook Islands

Climate zones, seasonal temperatures, rainfall patterns, and best travel times

The Cook Islands feature a warm, tropical climate year-round with oppressive, wet summers and comfortable, muggier winters. Located in the tropical South Pacific, the islands experience consistent temperatures, high humidity, and significant rainfall, particularly during the wet season. The climate is Köppen-classified as Tropical Rainforest (Af), with no true cold season. Summers are warm and overcast, while winters are partly cloudy and windy. The drier months span April to November, offering pleasant 26°C averages. Residents enjoy abundant sunshine, though humidity remains high. The islands are prone to tropical weather variability, including ENSO influences. Overall, the climate is ideal for those seeking a warm, oceanic lifestyle with lush landscapes and minimal temperature fluctuation.

Summer Average

27-30°C

Winter Average

22-25°C

Climate Types

Tropical Rainforest

Annual Rainfall

1500-3000 mm

Sunshine Hours

2,600-2,900 hrs/yr

Average Humidity

75-85%

Regional Climate Variations

Island Regions

The Cook Islands consist of 15 low-lying coral islands and two volcanic high islands, all sharing a uniform tropical climate. Rarotonga, the main island, experiences the most consistent weather patterns, with February as the hottest month (84°F average high) and August as the coolest (69°F average low). Skies are clearest in August, offering optimal sunshine. Rainfall is high year-round, especially during the wet season (December–March), with annual totals exceeding 1500mm. Humidity remains consistently high (75–85%), contributing to the oppressive summer feel. Winters are muggier but comfortable, with partly cloudy skies and steady winds. The climate supports lush vegetation and a vibrant marine ecosystem. Residents enjoy warm temperatures daily, with minimal seasonal variation. The islands are influenced by tropical systems and ENSO conditions, requiring preparedness for weather shifts.

Summer:27-30°C

Winter:22-25°C

Very high rainfall

Warm, wet, and oppressive summers with high humidity and overcast skies; comfortable, muggier winters with partly cloudy conditions and steady winds. The climate feels consistently tropical, lush, and oceanic, ideal for beach living and lush landscapes.

The Cook Islands offer a uniform tropical rainforest climate with warm temperatures year-round, very high rainfall, and high humidity. Ideal for residents seeking a warm, oceanic lifestyle with lush scenery and minimal temperature fluctuation, though preparedness for tropical weather variability is essential.

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