Olosega, Samoa offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Olosega, Manu a, Samoa, is known for its stunning natural beauty, including the National Park of American Samoa and the pristine beaches of Olosega Island. The best time to travel to Olosega, Samoa, is from May to October, when the average air temperature is around 79-86°F (26-30°C) and the water temperature is approximately 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!