Great Barrier Island, New Zealand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Great Barrier Island is known for its stunning beaches and remote, unspoiled natural beauty. The best time to travel to Great Barrier Island, New Zealand, is during the summer months of December to February, when the average air temperature is around 24°C (75°F) and the water temperature is approximately 21°C (70°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!