Zurriola - surf spot statistics

Best Surf Season (October - March)

The heart of the North Atlantic storm track delivers consistent, powerful swell to this northwest-facing beach. From October through March, average swell heights hover between 1.6m and 2.1m with long periods (11-13s), providing punchy, rippable waves on the best days. The dominant swell directions are NW, WNW, and NNW—all squarely in the window for Zurriola. Wind percentages are at their annual peak, with offshore flow from the S and SSW quadrant blowing 40-46% of the time. Frontal passages and deep low-pressure systems spinning out of the Labrador Sea generate solid groundswell trains that wrap into the bay. When the timing aligns with light offshore winds and clearing skies, you get firing, glassy conditions.

Fair Surf Season (April & September)

These shoulder months see a noticeable drop in average swell energy—April sits at 1.5m / 10.8s, September at 1.3m / 10.4s—but still offer decent, fun-sized waves. The North Atlantic begins to transition: spring low-pressure systems are less frequent, and autumn highs start to build. Ideal wind frequency falls to around 32%, meaning you'll need to pick your windows carefully. NW and WNW swells still dominate, but wave heights are smaller and more variable. Surfable conditions occur on days when a late-season storm or early-autumn cold front tracks favorably, bringing a clean, long-period swell that coincides with a southerly breeze. Those are the moments when the lineup comes alive without the heavy crowds.

Low Surf Season (May - August)

Summer settles in and Zurriola's swell engine goes into low gear. Average heights drop to 1.0-1.2m with periods around 8-9s, yielding mostly weak, short-period swell that struggles to push above chest-high. The wind picture also worsens: ideal offshore wind percentages plummet to 18-29%. NW and WNW swells still occur but are dominated by short-period windswell rather than groundswell. Frequent onshore north-northwesterly wind (bad, riffles the surface) and strong sea breezes combine to create choppy, messy conditions more often than not. Small surf but still rideable on days when a weak low passes or a thermal low pumps in a light southerly breeze. Expect groveling conditions on shortboards or longboards – definitely not the time for epic pits. Local summer cyclones (medicanes) are rare but can throw a wildcard swell into the mix.

May: Grovel Threshold Begins

May sees the surf drop to 1.2m average with a period of 9.9s, right on the cusp between average and short-period. The swell rose is overwhelmingly NW (50.9%) and WNW (28.0%), but over half of those NW waves are under 1.5m. Fun-sized, rippable conditions occur on about 30% of days, but it's often small and weak. Ideal wind frequency decreases to 29%, with a notable increase in lighter winds (0-10kph) across all directions. The S wind still appears (6.7%) but weak. Onshore NW wind (12.4%) and NNW (9.6%) become more common, typically associated with afternoon sea breezes that destroy the morning glass. May is the month where thermal low-pressure systems develop over Spain, drawing in cool onshore flow. The best swell comes from late-season Atlantic storms that spin up unexpectedly. If you get a 10-11s NW swell with a dawn S wind, you can score clean waist-high lines. Otherwise, it's a longboard or summer-fun board month.