It's a river beach in River Tejo (between Lisbon and Almada). The water is a bit dirty as well as the sand. Soft tide. Waves from 0-1m usually from the left.
During winter wetsuit necessary, air 10-20ºC, water 5-10ºC, during summer(from June to September's end) short's are enough, air 25-35ºC, water 10-20ºC.
Arrived at Lisbon Airport head to the other side of the river over Bridge 25 de Abril (from there you can see some silos on the left side there near the spot), pass the bridge and leave the highway in the first exit, to Costa Caparica (IC-20) until the end of it, stay at right lane and turn right heading to Trafaria (lots of round ways), in the last roundway turn right and the first left...in the end of dirt road, between some wood houses, is the spot.