Ilia, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ilia, Central Greece, Greece, is known for Ancient Olympia, the birthplace of the Olympic Games. The best time to travel to Ilia, Greece, is from May to September, with average air temperatures ranging from 75°F to 85°F and water temperatures around 73°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!