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.

September: The Spring in the Step

September signals the beginning of the transition back to winter. Average swell height edges up to 1.4m, period to 10.6s – average to fun. Wind ideal percentage remains high at 61%, with offshore winds from N (13.3%), NW (17.8%), and NNW (17.4%) still dominant. Swell from the NW accounts for 55.4%, but we start to see a noticeable uptick in WSW (2.1%) and SW (0.7%) – still a tiny fraction, but a promising sign. The North Atlantic is waking up, and the first proper storm swells can arrive late in the month. Most days offer small, clean waves, but there is an increasing chance of a longer-period, bigger swell if a low pressure system tracks south. Start watching the synoptic charts – best season is around the corner.