Aterro - surf spot statistics

Aterro in Portugal offers consistent surf conditions throughout the year, but the best months for surfers typically fall between October and March. During this period, ground swell dominates, with percentages ranging from 62% in October to 89% in January, ensuring powerful and well-formed waves. The mean swell size is also most favorable, averaging between 1.3m and 1.7m, providing ideal wave heights for intermediate to advanced surfers. Wind conditions improve slightly in these months, with good wind days peaking at 43% in January and December, though offshore winds remain somewhat inconsistent. From April to September, conditions deteriorate as wind swells take over, reducing wave quality, and bad wind conditions dominate, often exceeding 70%. Swell size drops below 1.0m in summer, making it less reliable for serious surfers. While Aterro is surfable year-round, the winter and early spring months deliver the most consistent, high-quality waves with better wind alignment, making them the prime time for surfing at this spot.

March at Aterro offers fairly consistent surf with an average swell height of 1.5m and a solid 12.5s period, which often provides clean, well-organized waves. The dominant swell direction comes from the west and northwest, with the best conditions typically occurring in the 1-2.5m range, offering a good mix of power and rideability. Westerly and southwesterly winds are prevalent, but 34% of the time, the wind is favorable for surfing—usually light offshore or cross-offshore. March sees the most consistent waves in the 1-2.5m range, with WSW and W swells making up the majority, delivering quality surf about half the time. However, stronger northerly and northwesterly winds can occasionally disrupt conditions, especially in the mornings. Overall, March is a solid month for intermediate to advanced surfers, with windows of excellent conditions when wind and swell align.