Santa Cruz Island, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Santa Cruz Island, California, United States, is known for Channel Islands National Park and its unique biodiversity, including the endemic Santa Cruz Island fox. The best time to visit Santa Cruz Island, United States, is from late spring to early fall, with average air temperatures ranging from 60-75°F and water temperatures around 60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!