Sesi, Greece offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sesi, Attica, Greece, is known for its picturesque beaches and proximity to the ancient site of Amphiareion. The best time to travel to Sesi, Greece, is from late May to early October, with average air temperatures ranging from 75°F to 85°F and water temperatures around 72°F to 78°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!