Agioi Theodoroi, Greece offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Agioi Theodoroi is known for its proximity to the ancient site of Isthmia and the Loutraki Thermal Spa. The best time to travel to Agioi Theodoroi, Greece, is from late May to early October, 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!