Waikawau, New Zealand offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Waikawau, Waikato, New Zealand, is known for the Waikawau Tunnel Beach, a unique beach accessed through a hand-carved tunnel. The best time to travel to Waikawau, New Zealand, is during the summer months of December to February, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!