Mundaka - surf spot statistics

Best Surf Season (October - March)

The North Atlantic roars to life during these months, with powerful extratropical cyclones marching across the basin. Mundaka, exposed to the north, reaps the rewards as consistent NW, NNW, and WNW swells dominate the waverose. Average wave heights hover around 1.7-2.0m, often pushing into the 2-2.5m range, with long-period energy (12-13s) that wraps perfectly into the famous left. The wind picture is equally promising: southerly quadrants (S, SSW, SW) blow offshore 25-30% of the time, grooming the wave face for those iconic barrels. High-pressure systems over the Bay of Biscay or the Mediterranean often set up these light offshore breezes. While winter lows can bring onshore NW winds, the overall frequency of ideal conditions is at its peak, making this the prime window for Mundaka.

Fair Surf Season (April & September)

As the seasons transition, the Atlantic storm track begins to shift. April sees a slight drop in average swell height to 1.4m, but NW swell still accounts for nearly 40% of the spectrum, keeping the wave alive. Offshore wind percentages dip to around 21-24%, but when a late-season low aligns with a high-pressure ridge, you can score clean head-high waves. September marks the beginning of the autumn ramp-up; average swell heights climb to 1.2m and periods nudge over 10 seconds. The NW direction still dominates, and the wind turns more favorable as the percentage of S/SSW flow increases. Both months offer a decent chance at good surf, though consistency is lower than the peak season.

Low Surf Season (May - August)

Summer takes hold and the North Atlantic high pressure system becomes more dominant, suppressing the storm track. Average swell heights fall to 0.9-1.1m, periods drop to 8-9 seconds, and the swell energy shifts toward shorter-period NW windswell. While NW remains the dominant direction, the lack of power means waves are often small and crumbly. More critically, offshore wind frequencies plummet to just 14-21%, with persistent onshore northerlies (N, NW, NNW) degrading the wave quality. Thermal low pressure over the Iberian Peninsula can occasionally trigger afternoon seabreezes, but these are usually light onshore. This is the time for groveling on a minimal or taking a longboard if you must surf, but Mundaka is not at its best. Consider this the offseason.

April: Transitional Swell

April marks the transition to spring. Average swell height drops to 1.4m, with period falling to 10.7s – still average to powerful. NW swell still dominates at 40.3%, with WNW at 22.8% and NNW at 18.1%. The size range shifts: most waves are now 0.5-1.5m, though overhead sets still occur. Offshore wind frequency drops to 21%, with S/SSW (4.9% and 4.7%) still the main quality directions. The wind becomes more fickle as thermal effects start to play a role; morning sessions are key. You can still score great waves if you pick your days, especially when a passing cold front stalls over Europe.