Cote des Basques seasonal overview
Best Surf Season (October - March)
The North Atlantic wakes up properly by October, and Cote des Basques turns from a sleepy summer beach into a consistent, powerful surf spot. From October through March the average swell height hovers between 4ft and 6ft (1.3m and 1.8m) and the average period stays above 11 seconds, peaking at 13.0 seconds in January. These are long-period, open-ocean groundswells generated by strong extratropical lows racing across the Atlantic. With the beach facing west-north-west, the dominant WNW and NW swells have an almost unobstructed run into the bay. Statistically, the ideal wind window rises to between 40 and 46 percent during these months, giving surfers a much better chance of finding clean, groomed conditions. This is the heart of the Basque surf season.
Fair Surf Season (April, May and September)
April and May represent the spring transition. The storm track starts to retreat north, average swell drops to 3-4ft (1.0-1.2m) and the period falls to 10-11 seconds. September is the mirror image on the other side of summer, with the swell average creeping back to 3-4ft (1.1m) as the first autumn lows begin to form. These shoulder months can still produce fun peaks, especially when offshore flow lines up with a late-season WNW groundswell, but the percentages are lower and you have to work harder for the clean windows. Wetsuit choice becomes easier and water temperatures are pleasant, but consistency takes a step back.
Low Surf Season (June - August)
The Azores High becomes the main character during summer, usually parking itself over the eastern Atlantic and steering the westerly storm track well to the north. Average swell falls to 3ft (0.9m), average periods drop into the 9.0-9.4 second range and the ideal wind window slumps to 17-21 percent. The wave rose is dominated by short-period NW and NNW windswell, often accompanied by afternoon sea breezes and onshore NW flow. Cote des Basques turns into a beach-day spot with occasional small, fun rippable waves, usually in the early morning before the sea breeze arrives or when a lingering groundswell coincides with an easterly offshore wind.