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.

July: Peak Summer Lethargy

July is the absolute nadir of surf quality at Zurriola. The numbers don't lie: average height 1.0m, period 8.8s (the lowest of the year), and ideal wind only 18%. The swell rose is even more extreme: NW contributes a staggering 65.3% of waves, but 36% of those are in the tiny 0.5-1m range. Only 2.5% of waves exceed 1.5m. The wind picture is brutal – onshore N (12.7%), NW (14.6%), and NNW (12.8%) dominate, often at 10-20kph. Southerly winds are rare (S 2.5%, SSW 2.3%). The sun's heating creates a deep thermal trough over the Iberian Peninsula, driving NW winds that are directly onshore and ruin wave quality. Small summer lows called 'thermal lows' can occasionally form to the south, bringing a day of S wind, but the swell is usually too weak to matter. Occasionally, a distant hurricane in the central Atlantic can send long-period energy (around 15s) that rides over the short-period junk, but that's once a summer at best. If you're in the water in July, it's for enjoyment, not for epic surf. Grab a longboard and enjoy the small stuff.