Ashton, Saint Vincent and the Grenadines offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Ashton, Grenadines, Saint Vincent and the Grenadines, is known for its proximity to the Tobago Cays Marine Park, a popular destination for snorkeling and sailing. The best time to travel to Ashton, Saint Vincent and the Grenadines, is from December to April, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!