Agios Vasileios, Greece offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Agios Vasileios, Crete, Greece, is known for the Preveli Monastery and the stunning Preveli Beach. The best time to travel to Agios Vasileios, Greece, is from May to September, with average air temperatures ranging from 75°F to 85°F and water temperatures from 72°F to 79°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!