Secarias, Portugal offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Secarias, Coimbra, Portugal, is known for its proximity to the scenic Mondego River and the historical city of Coimbra, home to the University of Coimbra, a UNESCO World Heritage Site. The best time to travel to Secarias, Portugal, is in late spring (May to June) 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!