Gyenesdias, Hungary offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gyenesdias is known for its proximity to Lake Balaton and the Balaton Uplands National Park. The best time to travel to Gyenesdias, Hungary, is from June to August, when the average air temperature is around 25°C (77°F) and the water temperature in Lake Balaton is approximately 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!