Agios Efstratios, Greece offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Agios Efstratios is known for its serene beaches and the Agios Efstratios Museum of Democracy. The best time to travel to Agios Efstratios, Greece, is from June to September, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!