Sines - surf spot statistics

Best Surf Season (October - March)

Winter brings the Atlantic to life, with average swell heights consistently over 2m and periods averaging 12-13 seconds, delivering powerful, long-period groundswell. Although the dominant swell direction is from the NW (which doesn't directly hit the south-facing beach), the frequent passage of strong extratropical cyclones dragging fronts across the Iberian Peninsula often produces pulses of S-SSW-SW swell that wrap perfectly into Sines. Combined with a higher incidence of offshore winds from the north quadrant (N, NNE, NE, NNW), the result is a 50-52% chance of ideal conditions. This is the prime window for pumping, firing waves in the 1.5-2.5m range, and occasionally XL days when the Atlantic aligns.

Fair Surf Season (April & September)

During the transition months of April and September, the storm track starts to shift, yet the ocean remains active. Average swell heights drop to 1.8m (April) and 1.4m (September), with periods around 11 seconds – still yielding solid, rippable waves. The Azores High begins to build or retreat, leading to a more mixed wind regime. Offshore winds from the north still dominate about half the time, but onshore southerlies become more frequent. These months are a classic gambler's window: you might score a clean, long-period SW swell with light N winds, or you might face smaller, choppier conditions. Best for the intermediate surfer looking for fun waves without the winter crowds.

Low Surf Season (May - August)

The summer months are defined by a strong Azores High, which suppresses the Atlantic storm machine. Average swell heights bottom out at 1.3m and periods slip to 8-9 seconds – small, fun-sized waves that require a grovel board. The upside is wind quality: with the thermal low over the Iberian Peninsula, north winds blow consistently, making offshore conditions (N, NNE, NW, NNW) the norm. In fact, ideal wind percentages peak at 55-61% in this period, meaning many days deliver clean, micro-to-small surf. While you won't chase XXL swells, this is the season for quiet morning sessions with smooth, rippable lines, especially on a longboard or fish.

November: Winter Peak Building

November is one of the best months of the year. Average swell height reaches 2.1m, period 12.0s – powerful, long period waves. The wind is ideal 51% of the time, with N (11.9%) and NNW (10.9%) winds, but a notable increase in southerly winds (S to SW totals 14.8%) means there are more days with onshore flow. However, when the wind is offshore, the waves are magnificent. Swell from the optimal S to SW directions totals 2.7% – the highest of any month. This is due to the frequency of deep Atlantic lows that track just west of Portugal, sending long-range S/SW swell directly into Sines. The majority of the swell remains NW (29.9%) but the southern component is enough to produce several firing days per month. Expect heavy, pumping waves in the 1.5-2.5m range, and the occasional XXL swell that requires a big-wave gun.