Ag Simeon, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ag Simeon, South Aegean, Greece, is known for its proximity to the iconic beaches and vibrant nightlife of Mykonos. The best time to travel to Ag Simeon, Greece, is from late May to early October, with average air temperatures around 75°F (24°C) and water temperatures near 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!