Sidirounta, Greece offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Sidirounta, South Aegean, Greece, is known for its proximity to the picturesque island of Mykonos and the historic site of Delos. The best time to travel to Sidirounta, Greece, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures near 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!