Port Waikato, New Zealand offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Port Waikato is known for its stunning black sand beaches and the mouth of the Waikato River. The best time to travel to Port Waikato, New Zealand, is during the summer months of December to February, when the average air temperature ranges from 20°C to 25°C (68°F to 77°F) and the water temperature is around 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!