Two Boats, Ascension Island offers 1 beach perfect for sunbathing, surfing, swimming, and more. Two Boats, Ascension, Ascension Island, is known for Green Mountain National Park and its unique volcanic landscapes. The best time to travel to Two Boats, Ascension Island, is from May to October, with average air temperatures around 25°C (77°F) and water temperatures near 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!