Siviri, Greece offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Siviri, Central Macedonia, Greece, is known for its beautiful sandy beaches and the annual Siviri Amphitheater Festival. The best time to travel to Siviri, Greece, is from June to September, with average air temperatures around 25-30°C (77-86°F) and water temperatures around 24-27°C (75-81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!