Kastrosikia, Greece offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Kastrosikia is known for its beautiful beaches and proximity to the ancient city of Nicopolis. The best time to travel to Kastrosikia, Greece, is from June to September, with average air temperatures around 77°F (25°C) and water temperatures near 75°F (24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!