Koufonisi, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Koufonisi, Crete, Greece, is known for its stunning beaches and the ancient Roman theater. The best time to travel to Koufonisi, Greece, is from late May to early October, with average air temperatures around 75°F (24°C) and water temperatures around 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!