Sises, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sises is known for its proximity to the ancient archaeological site of Eleutherna and the beautiful beaches of Bali. The best time to travel to Sises, Greece, is from May to September, 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!