Obyan, Northern Mariana Islands offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Obyan, Saipan, Northern Mariana Islands, is known for the Obyan Beach, a popular spot for snorkeling and exploring World War II relics. The best time to travel to Obyan, Northern Mariana Islands, is from December to June, with average air temperatures around 80-85°F (27-29°C) and water temperatures about 82-84°F (28-29°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!