Thebes, Greece offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Thebes is known for the archaeological site of the ancient city of Thebes, including the Cadmea and the Mycenaean palace complex. The best time to travel to Thebes, Greece, is from May to June when the average air temperature is around 75°F (24°C) and the average water temperature is about 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!