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.

April at this Brazilian surf spot offers solid conditions with an average swell height of 1.6m and a decent 9.6s period, providing consistent, well-formed waves. The swell is predominantly from the south to east-southeast, with the majority of waves (around 1-2.5m) coming from E, ESE, SE, SSE, and S directions—ideal for quality rides. Larger swells (2m+) are most frequent from the S and SSE, offering powerful, hollow sections when conditions align. Wind is the main variable, with only 20% of days being ideal (light offshore or sideshore). Northerly and easterly winds are common, often blowing in the 10-30kph range, which can create choppy or cross-shore conditions. However, when winds cooperate—typically light ENE or SE—the spot can be excellent, especially on SSE/S swells with longer periods. Overall, expect a mix of surfable days with occasional high-quality sessions when wind and swell direction align.