Cote des Basques - surf spot statistics

Best Surf Season (October - March)

Winter along the Basque Coast is when the North Atlantic engine truly fires up. Deep, powerful low-pressure systems track across the North Atlantic, sending long-period WNW and NW groundswells directly into the Cote des Basques receiving zone. Average swell heights range from 1.6m to 1.8m, with periods often exceeding 12 seconds, delivering punchy, powerful waves that can easily reach pumping, firing conditions in the 1.5-2.5m range. Critically, the frequency of ideal offshore winds – from the WNW, W, WSW, and SW quadrants – peaks between 43% and 46% during these months, grooming the waves to perfection. The NAO index often trends positive in winter, steering storms toward the Bay of Biscay and ensuring consistent swell. This is the prime window for serious surf at Cote des Basques.

Fair Surf Season (April & September)

These transitional months offer a mixed bag. April sees a drop in average swell height to 1.2m with periods around 11 seconds, while September sees a rise back up to 1.1m and 10.6s. The Atlantic storm track begins to shift in April and is just revving up in September. While you won't get the consistent power of winter, there are still plenty of rideable days. Ideal wind percentages hover around 29-30%, which means clean, offshore conditions occur less frequently but are definitely attainable. Expect a blend of fun-sized groundswells and smaller groveling waves, especially early in April and late in September. Good for loggers and those who don't mind working a little harder for their waves.

Low Surf Season (May - August)

Summer brings the doldrums to the Bay of Biscay. The North Atlantic high-pressure system strengthens and shifts north, pushing the storm track away from the region. As a result, average swell heights plummet to just 0.9m to 1.0m with periods dropping into the 9-second range. The dominant swell direction remains NW and WNW, but the energy is significantly weaker. Worse, the frequency of ideal offshore winds plummets to between 17% and 23%. The prevailing winds become more westerly and stronger, often ruining wave quality with onshore conditions. While the occasional small, fun-sized wave might pop up from distant storms or local sea breeze patterns, this is primarily a quiet period. Surfers will find themselves groveling on small, weak waves, and the best chance for anything rideable usually comes early in the morning before the wind picks up. Summer is for beach days and travel elsewhere.

January: The Heart of Winter Power

The North Atlantic is at its most active in January, with a strong polar jet stream fueling deep low-pressure systems. This is reflected in the numbers: an average swell height of 1.8m and a long average period of 13.0s. A staggering 72% of all wave energy comes from the optimal WNW and NW directions, with most of that falling into the 1.5-2.5m 'pumping' range. Ideal offshore winds (WNW, W, WSW, SW) occur 44% of the time, which means when your wind direction lines up, the waves are absolutely firing. However, note that onshore winds from the S and SSW also blow frequently (21.8% combined), so timing is everything. January delivers powerful, long-period groundswells that wrap into the bay beautifully – the kind of swell that has you re-thinking your board choice.