Agios Dimitrios, Greece offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Agios Dimitrios, Central Greece, Greece, is known for its proximity to the scenic Parnassos National Park and the historic Delphi archaeological site. The best time to travel to Agios Dimitrios, Greece, is from May to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!