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.

August: Late Summer Glimmers

August is slightly better than July but still firmly in the low season. Average height remains 1.0m, period edges up to 9.2s, and ideal wind improves to 21%. Swell direction is nearly identical to July: NW (64.9%) and WNW (15.9%). While most waves are still small, there's a slight increase in 1-1.5m range (23% of NW swells) compared to July. Wind: onshore N (12.5%), NW (12.8%), NNW (11.7%) remain problematic, but there's a little more S and SSW wind (3.3% and 2.5%) than in July. Late August often sees the first signs of the autumn transition: a tropical storm or former hurricane meandering north in the Atlantic can send a pulse of long-period swell (12-15s) toward the Cantabrian coast. These events are rare but can jack the swell to head-high with clean conditions if the low tracks far enough west. Thermal lows also become a bit more active, ushering in light southerly breezes early in the day. So August still requires patience, but the best part of the month shows the promise of September.