Mokau, New Zealand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mokau is known for its stunning black sand beaches and the iconic Three Sisters rock formations. The best time to travel to Mokau, New Zealand, is during the summer months of December to February, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 19°C (66°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!