Costa da Caparica - surf spot statistics

Best Surf Season (October - March)

The heart of the surf season at Costa da Caparica aligns with the North Atlantic winter, when strong extratropical cyclones march across the ocean, generating powerful long-period swell. From October through March, average swell heights range from 1.5m to 2.0m, with periods consistently in the 11-13 second range — perfect for producing punchy, well-defined lines. The dominant swell directions are from the WNW, NW, and W, which wrap well into the west-southwest facing beach. More importantly, the offshore wind window from NNO to O is at its peak frequency, with ideal wind percentages between 40% and 46%. This combination delivers clean, hollow waves on a regular basis. The NAO index plays a key role: a positive NAO often funnels stronger low pressures toward Iceland, amplifying swell production for Portugal. Expect firing conditions with occasional overhead to double-overhead sets when a strong low locks in.

Fair Surf Season (April & September)

Transition months April and September offer a mixed bag. April sees average swell heights dropping to 1.5m with periods around 11s, still rideable but less consistent. The offshore wind frequency falls to 32%, and the wind regime becomes more variable with increasing onshore flow from the SW quadrant. However, spring also brings occasional late-season lows that can rekindle winter-like power. September is the mirror image: average heights around 1.1m but periods climb back to 10.5s as the first autumn lows begin to organize. Offshore wind frequency improves to 36%, and the water is still warm. Both months can deliver fun, rippable waves, especially on the sets, but expect more smaller days and a need to pick the right tide and window.

Low Surf Season (May - August)

The summer months from May through August are the leanest period for consistent surf at Costa da Caparica. Average swell heights hover around 1.0-1.2m with periods dropping to 8-10 seconds, resulting in weak, short-period swell that often struggles to produce quality waves. The dominant swell is from the NW and NW with a significant component of short-period windswell. Offshore wind frequency plummets to 23-28% as the trade wind-like northerly flow (N, NNW) strengthens, but these are often cross-offshore at best, and the prevailing NW sea breeze becomes more pronounced in the afternoons. While early mornings can offer clean, fun-sized waves for longboarders and grovelers, the summer pattern is generally small and weak. The best bet for a session is often a dawn patrol with a small high tide. Despite the lack of power, the warm water and favorable winds on the rare occasion that a SW groundswell coincides with a northerly breeze can produce a memorable day.

May: Small Swell and Summer Grovel

May sees a significant drop in average swell height to 1.2m and period to 10.0s. The swell is dominated by NW (40.2%) and WNW (32.8%), with a growing contribution from short-period northwest windswell created by the strong northerly winds. Wave heights over 1.5m become rarer. The ideal wind percentage dips to 28%, and the wind regime is increasingly from the N (20.6%) and NNW (25.8%) — which are offshore but often too strong, creating choppy conditions. Onshore winds from the S-SSW also become more common. Surfing days are characterized by small, fun-sized waves, best on a longboard or a groveler. The early mornings can still produce clean, waist-high waves, especially if there's a weak southwest groundswell in the water. This month is more about taking what you get.