São Lourenço in Portugal offers consistent surf conditions year-round, with the best months for experienced surfers being from October through March. During this period, ground swell dominates (66-91% of the time), providing powerful, well-organized waves with mean sizes ranging from 2.1m to 2.7m. The winter months (December-February) deliver the largest swells (2.6-2.7m) and the highest ground swell consistency (85-91%), making them ideal for advanced surfers seeking quality waves. However, wind conditions are less favorable, with only 28-31% of good offshore winds—onshore winds prevail 69-72% of the time, which can create choppy surfaces. Shoulder seasons like October-November and March offer a better balance, with decent ground swell (66-83%) and slightly improved wind prospects (25-27% good winds). From April to September, swell quality declines as wind swell takes over (36-84%), resulting in smaller (1.5-2.1m), less consistent waves. Summer months (June-August) are the least favorable, with weak swells (1.5m) and poor wind conditions (only 10-12% favorable). While São Lourenço rarely has flat days (0-1% no swell), the prime window for clean, sizable waves aligns with the Atlantic winter swell season, despite the challenging winds. Advanced surfers should prioritize late autumn to early spring, while beginners may find summer more manageable due to smaller waves.