Ag Ioannis Peristeron, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ag Ioannis Peristeron, Ionian Islands, Greece, is known for its luxurious resorts like MarBella Corfu and its beautiful beaches along the Ionian Sea. The best time to travel to Ag Ioannis Peristeron, 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!