Coressia, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Coressia is known for its picturesque harbor and as the main port of the island of Kea in the South Aegean, Greece. The best time to travel to Coressia, Greece, is from late May to early October, with average air temperatures around 75°F (24°C) and water temperatures near 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!