Kai Iwi, New Zealand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kai Iwi is known for the Kai Iwi Beach and the nearby Bason Botanic Gardens. The best time to travel to Kai Iwi, 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!