Kenai, United States offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Kenai is known for the Kenai River, Kenai Fjords National Park, and the Kenai National Wildlife Refuge. The best time to travel to Kenai, United States, is from June to August, when the average air temperature is around 55-65°F and the water temperature is approximately 50-55°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!