Sidonia, Greece offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sidonia, Crete, Greece, is known for the ancient Minoan Palace of Knossos. The best time to travel to Sidonia, Greece, is from May to September, 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!