Ag Theodoros, Greece offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Ag Theodoros, South Aegean, Greece, is known for its proximity to the historic site of the Temple of Apollo. The best time to travel to Ag Theodoros, Greece, is from late May to early October, with average air temperatures around 75-85°F (24-29°C) and water temperatures ranging from 72-79°F (22-26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!