Conca, France offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Conca, Corsica, France, is known for being the starting point of the famous GR20 hiking trail. The best time to travel to Conca, France, is from June to September, when the average air temperature is around 25°C (77°F) and the sea temperature is approximately 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!