Sifnos, Greece offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sifnos is known for its picturesque villages, traditional Cycladic architecture, and the historic Church of the Seven Martyrs. The best time to travel to Sifnos, 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!