Nikiski, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Nikiski is known for Captain Cook State Recreation Area, which offers scenic views and outdoor activities. The best time to travel to Nikiski, United States, is during July when the average air temperature is around 60°F (15°C) and the water temperature is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!