This is a large stretch of sandy beach and a big tourist destination for the Lisbon population. On summer days, the sand and car parks are packed, but off season is when the waves wake and this proves to be a consistent swell catcher. Low to mid tide is best, with peaks along the beach, high tide can be heavy with sections of shore dump. Line-ups will be busy when good, but there's room to spread out and Praia Pequena - an extension of the beach to the north - often holds quieter waves. Best in an easterly wind as it is exposed and still afternoons can often see localised onshores.
Source: Praia Grande (South) Surf Guide