Seal Beach, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Seal Beach, California, United States, is known for the Seal Beach Pier and the Seal Beach National Wildlife Refuge. The best time to travel to Seal Beach is from late spring to early fall, with average air temperatures ranging from 65°F to 80°F and water temperatures around 60°F to 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!