Aptos, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Aptos, California, United States, is known for the Forest of Nisene Marks State Park and Seacliff State Beach. The best time to travel to Aptos, United States, is from June to September, when the average air temperature is around 70°F (21°C) and the water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!