Amarynthos, Greece offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Amarynthos is known for its proximity to the ancient site of Eretria and the beautiful beaches along the Euboean Gulf. The best time to travel to Amarynthos, 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!