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.

December at Aterro offers solid surfing conditions with an average swell height of 1.6m and a healthy period of 12.7s, indicating consistent, well-spaced waves. The dominant swell direction is from the west and northwest, with the most frequent wave heights ranging between 0.5m and 2.5m—ideal for intermediate to advanced surfers. WSW and W swells provide the best quality, often delivering clean, rideable waves. Wind conditions are favorable 43% of the time, typically light to moderate (under 20kph) from the north and northeast, which helps keep the surface clean. However, stronger winds from the west or northwest can occasionally create chop. Overall, December is a reliable month for surfing here, with a good mix of size, consistency, and manageable winds, though wind direction variability requires checking daily forecasts for optimal sessions.