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.

July: Peak Summer Lull

July is the smallest month of the year: average height 1.3m, period 8.6s – messy to fun-sized depending on the day. The wind ideal percentage is 59%, the highest of the year, driven by north quadrant winds (N 14.3%, NW 25.3%, NNW 28.4%). Swell is almost completely from NW (69.6%) and NNW (16.9%), with nearly zero southern contribution. The waves are short-period, choppy and best suited for longboards or funboards. Despite the small size, the reliable offshore wind means clean conditions are the norm. For many, this is the most pleasant time to be in the water, with sunny skies, light offshore breezes, and small but fun peelers. Focus on high-rep turns rather than seeking size.