Les Culs Nuls - surf spot statistics

Best Surf Season (October - March)

The North Atlantic delivers its heaviest punches during these months, with average swell heights of 1.6-1.8m and long periods (11.3-13.0s) from the NW and WNW corridors. Dominant strong low-pressure systems tracking across the Atlantic generate consistent, powerful groundswell that hits this west-facing beach with maximum intensity. Offshore winds from the SW to WNW quadrant, though counterintuitive for a west-facing spot, are actually the most prevalent and create glassy conditions, especially when the winds are light. January and February stand out with the highest swell heights and idyllic wind percentages around 36-38%, making for firing, heavy waves in the 1.5-2.5m range. The months of October, November, and December show a ramp-up in size and period as winter storms intensify, offering frequent pumping sessions.

Fair Surf Season (April & September)

Transitional months bring a mixed bag. April sees the average swell drop to 1.2m with periods around 11.0s, while September averages 1.1m at 10.6s. The dominant swell still arrives from the NW and WNW, but with less power and consistency. Wind conditions become more variable, with ideal offshore percentages dropping to 26% in April and 29% in September. However, during these months, the North Atlantic can still fire up with a late-season storm or early autumn depression, delivering solid, rippable waves when the swell and wind align. These months offer a good compromise: fewer crowd, and the chance for punchy, fun-sized waves on the better days.

Low Surf Season (May - August)

Summer sets in, and the surf slows to a crawl. Average swell heights bottom out at 0.9m from June through August, with periods dropping to 9.0-9.4s. The dominant swell remains from the NW, but now consists largely of weak, short-period windswell generated by summer high-pressure systems and mild North Atlantic lows. The ideal wind percentage plummets to 18-22%, as the region falls under the influence of stronger onshore breezes from the NW and W that ruin wave quality. Most days are small and choppy, with only thigh-high grovelers or micro waves. Occasionally, a strong tropical cyclone or unusual summer storm can produce a brief pulse of long-period swell, but these events are rare. For dedicated surfers, a longboard or foiling setup is often the tool of choice during this stretched-out flat spell.

October: Season Kicks into Gear

October sees a significant jump in surf quality, with average swell of 1.3m and period of 11.3s. Swell directions are fairly balanced between NW (42.1%) and WNW (41.2%), with 22% of waves in the 1.5-2.5m range. Ideal wind hits 36%, the best since March. Winds from the optimal quadrants (SW through WNW) account for over 30% of observations, often at moderate speeds (10-20kph). The onshore westerlies are still present but less dominant. When a low-pressure system organizes in the Atlantic, combined with a high over Biscay, October can deliver superb overhead waves with clean offshore winds.