Troizinia, Greece offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Troizinia is known for the ancient ruins of the Sanctuary of Poseidon and the historical site of the ancient city of Troezen. The best time to travel to Troizinia, 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!