Thonse West, India offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Thonse West, Karnataka, India, is known for the St. Mary's Island, a popular tourist attraction with unique hexagonal basalt rock formations. The best time to travel to Thonse West, India, is from November to February, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!