Alonnisos Municipality, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Alonnisos Municipality is known for the Alonnisos Marine Park, the largest marine protected area in Europe. The best time to travel to Alonnisos Municipality, Greece, is from June to September, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!