Karistos, Greece offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Karistos, Central Greece, Greece, is known for the historic Karystos Castle and the scenic Dimosari Gorge. The best time to travel to Karistos, Greece, is from May to September, with average air temperatures around 25°C (77°F) and water temperatures about 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!