Whitianga, New Zealand offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Whitianga is known for Cathedral Cove and the Mercury Bay area. The best time to travel to Whitianga, 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!