Hakalau, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hakalau is known for the Hakalau Forest National Wildlife Refuge, which is a haven for birdwatching and native Hawaiian flora and fauna. The best time to travel to Hakalau, United States, is from May to October, with average air temperatures around 75°F (24°C) and water temperatures near 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!