Hydra, Greece offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Hydra is known for its well-preserved architecture, the absence of motor vehicles, and the historic Hydra Port. The best time to travel to Hydra, Greece, is from May to October, with average air temperatures ranging from 70-85°F (21-29°C) and water temperatures around 70-77°F (21-25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!