Prainha - surf spot statistics

Best Surf Season (October - March)

The North Atlantic winter machine is in full swing, delivering a relentless pulse of powerful, long-period swell to Prainha's west-facing shores. Average wave heights sit consistently between 2.5m and 2.8m with periods averaging 12-13s, meaning clean, lined-up waves are the norm. Offshore winds from the NO (NW) to OSO (WSW) quadrant occur 37-44% of the time, often aligning with passing cold fronts and post-frontal high-pressure ridges. This is the prime window for epic sessions – expect heavy, grinding barrels and long walls when a solid W or WNW swell meets light easterly morning wind.

Fair Surf Season (April - May & September)

As the atmosphere transitions, the power dials back a notch but quality remains high on the right days. April and May see average heights drop to 1.8-2.1m with periods around 10-11s, while September sees a sharp uptick in swell activity as early autumn storms begin to spin up. Wind consistency improves, with ideal offshore conditions occurring 24-31% of the time. These shoulder months often deliver the best combination of manageable size, lighter winds, and uncrowded lineups – perfect for carving up fun, rippable walls without the winter crowds.

Low Surf Season (June - August)

Summer sets in with a persistent northerly wind regime that keeps the ocean ragged and the swell small. Average wave heights hover around 1.5-1.6m, and periods drop to 8-9s, leaving the waves weak and choppy. The dominant N and NNW winds blow 30-35% of the time, creating onshore conditions that kill the wave quality. While the rare S-SW groundswell can sneak in, it’s typically small and short-lived. This is the time for groveling on a longboard or chasing wind protection; the magic of Prainha’s winter power is on hold until the autumn equinox signals the return of the North Atlantic.

March: Transitional Bite Remains

March still carries winter’s punch with an average swell of 2.5m and a 12.4s period. Swell direction is heavily focused on NW (21.2%) and WNW (16.3%), with NNW (13.5%) adding more size. Ideal wind frequency drops to 37%, the lowest of the winter months. North winds dominate at 21.1% (light to moderate), while NNW winds (12.0%) also blow often. The east and southeast winds (E, ESE, SE) together account for 13.4% and can produce glassy conditions if light. However, westerly winds (W, WNW, SW) still show up 15% of the time and bring onshore slop. March is a month of contrasts – you can score flawless 2m+ walls one day and get blown out the next. Keep an eye on the high-pressure ridges that bring clear skies and light east winds.