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.

June in Rosa, Brazil, offers consistent surf conditions with an average swell height of 1.6m and a solid period of 10.0s, producing clean, well-formed waves. The swell direction is predominantly from the south (S, SSE, SE), with the highest frequency of rideable waves (1.5-2.5m) coming from S (20.9%) and SSE (7.1%). ENE and E swells also contribute smaller but frequent waves (0.5-1.5m). Wind conditions are less favorable, with only 26% of days offering ideal offshore or light cross-shore winds (typically ENE to E). Stronger onshore winds from N to NNW are common (up to 30+ kph), which can create choppy conditions. For advanced surfers, the best sessions will come when south swells combine with ENE/E winds, offering powerful, well-shaped waves, while intermediate surfers may prefer smaller ENE/E swells. Watch for wind shifts, as northerlies can quickly degrade conditions.