Sao Juliao - surf spot statistics

Best Surf Season (October - March)

The North Atlantic roars to life during this six-month window, delivering the most consistent and powerful surf of the year at Sao Juliao. Average swell heights range from 2.0m to 2.6m, with periods frequently in the 12-13 second range – a recipe for long-period groundswells that wrap into the WNW-facing beach with authority. The dominant swell directions are NW, WNW, and NNW, which together account for over 50% of the total swell energy in most months. This is when the jet stream is most active, spawning deep extratropical lows that send clean, lined-up waves to the Portuguese coast. Offshore wind conditions (from the E to SE quadrants) occur roughly 20-25% of the time, often during post-cold-frontal setups with light easterlies. When these align, expect pumping, heavy surf in the 1.5-2.5m range with epic, long-period waves that make the beach a world-class destination. The best windows are often in November, December, and January, when the NAO index can be negative, steering storms toward the Iberian Peninsula.

Fair Surf Season (April - May)

As spring arrives, the frequency of powerful low-pressure systems begins to wane, but the Atlantic still provides a steady supply of moderate-groundswell energy. Average swell heights drop to 1.7-2.0m, while periods shorten to 10-11 seconds, producing average, punchy waves that remain fun and rippable. NW and WNW swells still dominate, but the wind patterns become less reliable for perfect conditions. Ideal offshore easterlies occur only 9-12% of the time, as the dominant wind starts to shift from northerly (cross-shore) to more frequent sea breezes. Early-morning sessions often offer the best chance for clean faces before onshore winds pick up. This is a transition season – you’ll need to work for the good days, but when a strong spring storm aligns with a high-pressure ridge, you can enjoy solid surf with far less crowds than winter.

Low Surf Season (June - September)

The summer months bring a dramatic reduction in both swell size and quality. Average heights slide to a paltry 1.4-1.6m, and periods drop to 8-10 seconds – often producing choppy, weak, and messy waves. The swell direction remains locked in from the NW and NNW, but these are generally windswell or shorter-period pulses with minimal power. The real killer is the wind regime. A dominant northerly flow (N and NNW) sets in, blowing along the coast at 20-40 kph for the majority of days. This creates strong cross-shore to side-onshore conditions that spoil the wave shape. Ideal offshore easterly winds are a rarity, occurring only 2-5% of the time in July and August. The surf is generally limited to small, fun-sized groveling waves for the shortboard, or longboard glide on the rare, cleaner days. Dawn patrol is your only hope, as thermal-driven onshore winds develop quickly. With high pressure locked over the Azores, the summer pattern is reliable – but not for good surf. Plan your trip elsewhere or bring a log and low expectations.

November: Prime Time Gold

November is one of the very best months at Sao Juliao, with the Atlantic firing on all cylinders. Average swell height is 2.3m and period is 12.0 seconds – firmly in the very powerful, long-period zone. Swell directions are well-distributed: NW (23.7%), NNW (17.4%), WNW (15.6%), and W (5.6%) bring a mix of groundswell and the first winter stormswells. Wave heights in the 1.5-2.5m range make up over 45%, with another 14% exceeding 2.5m. Ideal wind conditions are excellent at 22%, as the wind regime becomes more diverse. Northerly winds (N at 14.9%, NNW at 8.9%) are still present but lighter and more manageable, while offshore easterlies (E to SSE) account for about 30% of wind observations. The battle between lows and highs creates frequent clean windows. When a deep low in the North Atlantic pumps a W or WNW swell and a high pressure over central Europe directs light offshore ENE winds, the result is epic, pumping surf with long lines and hollow barrels. November consistently delivers the quality and consistency that draws surfers from around the world.