Aver o Mar, Portugal offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Aver o Mar is known for its beautiful beaches and proximity to the vibrant city of Porto. The best time to travel to Aver o Mar, Portugal, is from June to September, when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!