Namu, Marshall Islands offers 1 beach perfect for sunbathing, surfing, swimming, and more. Bikini Atoll is known for its role in nuclear testing history and as a UNESCO World Heritage site. The best time to travel to Namu, Marshall Islands, is from December to April, with average air temperatures around 81°F (27°C) and water temperatures near 82°F (28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!