Bikini Atoll, Marshall Islands offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Bikini Atoll is known for its World War II shipwrecks and nuclear test sites, attracting divers and history enthusiasts. The best time to travel to Bikini Atoll, Marshall Islands, is from May to October, with average air temperatures around 82°F (28°C) and water temperatures near 84°F (29°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!