Keanae, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Keanae, Hawaii, United States, is known for the Keanae Peninsula, Keanae Arboretum, and its traditional taro fields. The best time to visit Keanae, United States, is from April to October, with average air temperatures around 75-85°F and water temperatures near 75-80°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!