Guincho is where the world cup holds a wave event and the conditions can be epic but beware - there can be three week periods with no wind. The most reliable time is April through September but whenever there's a high pressure over the Azores you can be sure that some good wind and waves are on their way to Guincho. The sailing is starboard tack varying from perfect sideshore to side/onshore and side/offshore. Waves are normally in the half metre to two metre range but during full moons it can get really big. So be prepared for ripped sails and broken boards and masts. Luckily there's a shop right on the beach.