Rosa - surf spot statistics

Prainha, or Rosa, in Brazil is a consistent surf spot with year-round swell, primarily dominated by wind swell rather than ground swell. The best months for surfing here are generally from April to September, when ground swell percentages increase, offering better-quality waves. During this period, ground swell averages between 28% and 42%, peaking in May and June with 42%, which means more powerful and organized waves. Swell size remains relatively stable, averaging around 1.6m to 1.7m, with September seeing the largest mean swell at 1.9m. However, wind conditions are less favorable overall, with good wind days being relatively rare—typically under 26% throughout the year. The worst wind conditions occur from September to December, dropping below 15% favorable winds. Conversely, the slightly higher chance of good winds from May to June (24%–26%) makes these months more promising despite the persistent dominance of onshore winds. Outside the peak months, the high percentage of wind swell (often above 80%) creates choppier, less ideal conditions. If you prioritize wave consistency and size, target May through July; if you're willing to compromise on wind, September brings the biggest swells, though wind conditions are particularly poor. Overall, mid-year offers the best balance between swell size and quality, even though winds remain a challenge.

October at Rosa offers consistent surf with an average swell height of 1.7m and a decent period of 9.0s, producing well-organized waves. The swell predominantly arrives from the ENE to SSE, with the largest proportion coming from the E (9.56% at 1.5-2m) and ESE to SSE directions, providing good power and shape. Around 34% of swells measure between 1.5-2.5m, ideal for intermediate to advanced surfers, while smaller days (0.5-1.5m) still offer manageable waves. Wind conditions are a mixed bag—only 13% of the time are they ideal for surfing, typically light offshore flows from the west or northwest. However, northeasterly and easterly winds are more common, often blowing 10-30kph, which can create choppy conditions, especially when stronger NNE winds (20-40kph) occur. The best sessions will coincide with easterly swells and lighter winds, but expect variable conditions with some onshore interference. Overall, October delivers solid surf, though patience and timing are key to scoring the cleanest waves.