Ierissos, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ierissos is known for its proximity to Mount Athos, a UNESCO World Heritage Site and important center of Eastern Orthodox monasticism. The best time to travel to Ierissos, Greece, is from late May to early October, with average air temperatures ranging from 70°F to 85°F and water temperatures from 70°F to 78°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!