Things to Do in Cook Islands in December
December weather, activities, events & insider tips
December Weather in Cook Islands
Is December Right for You?
Advantages
- Lushest landscapes of the year - waterfalls at peak flow and vegetation at its most vibrant green after months of rain
- Lowest accommodation prices outside January-February, with resort rates 30-40% below dry season peaks
- Excellent surfing conditions on southern beaches like Titikaveka with consistent 1.5-2m (5-7ft) swells
- Mango season peaks in December - locally grown Bowen mangoes and tropical fruits at roadside stalls for NZ$2-4 per bag
Considerations
- Wettest month with rain falling 12+ days, often as intense afternoon storms lasting 45-90 minutes that can disrupt outdoor plans
- Highest humidity levels make temperatures feel like 32-35°C (90-95°F), particularly uncomfortable for visitors from temperate climates
- Rough seas on northern and western coasts limit snorkeling and diving opportunities to protected southern lagoons only
Best Activities in December
Rarotonga Cross-Island Trek
December's rains create spectacular waterfall displays along the cross-island track, with Te Rua Manga (The Needle) offering dramatic cloud forest conditions. Morning starts (7-8am) avoid afternoon storms and provide cooler temperatures around 26°C (79°F). The 7km (4.3-mile) trek takes 4-5 hours and showcases the island's wettest season beauty.
Southern Lagoon Snorkeling
While northern waters are rough, southern lagoons around Titikaveka and Muri remain protected and offer excellent visibility between rain showers. December's plankton blooms attract manta rays and reef sharks. Water temperature stays warm at 27°C (81°F). Plan 2-3 hour sessions starting early morning or late afternoon.
Aitutaki Lagoon Day Trips
Despite being wet season, Aitutaki's lagoon remains swimmable and stunning. December offers the advantage of fewer crowds and dramatic sky photography opportunities with towering cumulus clouds. The 45-minute flight from Rarotonga operates daily weather permitting, with lagoon tours running 4-6 hours.
Cultural Village Experiences
December's frequent afternoon rains make covered cultural activities ideal. Village demonstrations of traditional crafts, coconut husking, and umu (earth oven) cooking happen regardless of weather. Evening cultural shows provide perfect rainy-day entertainment with traditional dancing and storytelling.
Fishing Charters
December marks peak season for yellowfin tuna and mahi-mahi fishing. Despite wet weather, morning charters (6am-11am) often operate in calmer conditions before afternoon storms develop. Southern waters remain more protected than northern fishing grounds.
Island Cycling Tours
The 32km (20-mile) coastal road offers spectacular wet season scenery with waterfalls visible from roadside. Early morning rides (6:30-10am) beat both heat and afternoon storms. Electric bike rentals help manage humidity and hills, particularly useful during sticky December conditions.
December Events & Festivals
Te Maeva Nui Constitution Celebrations (extended)
While the main festival occurs in August, December features community dance competitions and cultural events as groups prepare for the following year. Local villages host practice sessions open to visitors, offering authentic cultural experiences without tourist crowds.
Christmas Island Style Celebrations
Cook Islands Christmas blends Polynesian traditions with Christian celebrations. Church services feature traditional Cook Islands hymns in Maori, and communities organize beach barbecues and traditional dance performances. Many families welcome respectful visitors to public celebrations.