Chatham Islands, New Zealand offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Chatham Islands, Canterbury, New Zealand, is known for the Moriori culture and the unique Chatham Island forget-me-not. The best time to travel to the Chatham Islands, New Zealand, is from November to March, with average air temperatures around 15-20°C (59-68°F) and water temperatures around 14-17°C (57-63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!