Orio - surf spot statistics

Best Surf Season (October - March)

The heart of the Basque winter delivers the goods at Orio. As the North Atlantic storm track fires up, long-period NW and WNW swell trains march into the Bay of Biscay. With the beach facing NNW, these groundswells wrap in with power, often producing pumping 1.5-2.5m faces on the sets. The 42-44% of ideal wind (S to SSW) during these months is a huge plus – a classic Spanish swell-wind combo that sees offshore breezes grooming the lines into clean, hollow walls. December and January average a 2.1m swell with periods around 12.7s, meaning plenty of firing sessions. The NAO often goes negative, steering low pressures southward and feeding the Basque coast with consistent, high-quality surf. This is the prime window for charging.

Fair Surf Season (April - May & September)

As the seasons transition, the Atlantic energy begins to wane but still offers solid rideable waves. April and May see average heights drop to 1.5m and 1.2m respectively, with periods slipping to 10-10.8s. The wind remains favourable around 28-32% of the time, often from the south. You’ll still score fun, rippable 0.5-1.5m surf, especially on the better NW swells that manage to reach the coast. September is a gem – the first autumn lows start spinning, boosting average height back to 1.3m and periods to 10.4s, with 32% ideal wind. The water is still warm, and the crowds thinner than in winter. These months reward those who watch the charts closely for a synoptic setup that aligns a solid NW swell with a southern breeze.

Low Surf Season (June - August)

Summer settles in and the North Atlantic relaxes, leading to a prolonged stretch of small, weak surf at Orio. Average heights hover around 1.0m with short periods of 8.8-9.2s. The wind is ideal only 18-21% of the time, and the dominant NW wind (onshore for the spot) often ruins what little swell there is. The majority of waves come from the NW, but they are mostly in the small, fun-sized 0.5-1m range – better suited for a longboard or a groveler. The long-period groundswells are absent. Occasional weak fronts can provide a brief rideable pulse, but overall, the consistency and quality are low. This is the time for dawn patrol peace or exploring other spots if you need a proper wave.

March: Late Winter, Strong Swells

March sees a slight decrease to an average of 1.8m and 12.1s period, but the quality remains high. NW swell dominates at 37.5% (the highest monthly percentage in the data), and WNW adds 26.5%. The 1-2m range is the sweet spot – solid, rippable to pumping depending on the day. Ideal wind drops to 35%, with S (10.2%) and SSW (7.1%) still providing reliable offshore conditions. However, spring transitions bring increased variability: we see more SE and SSE winds (together ~13%) which can be side-offshore to offshore. The North Atlantic still roars with late‑season lows, so don’t be surprised by a firing 2.5m day. The chance of onshore NW wind (8.3%) is a bit higher but still manageable. March offers excellent surf with slightly lighter crowds than the deep winter months.