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.

November at this Brazilian surf spot typically offers consistent swells with an average height of 1.7m and a solid period of 8.9s, indicating well-formed, powerful waves suitable for intermediate to advanced surfers. The majority of swell energy comes from the E to SSE range, with the most frequent wave heights between 1-2.5m, peaking in the 1-1.5m and 1.5-2m ranges. This suggests plenty of rideable days with punchy, clean waves, particularly when ENE to ESE swells dominate. However, wind conditions are less reliable, with only 14% of days providing ideal offshore or light cross-shore winds (typically ENE to E). Onshore winds from NNE to SSW are more common, often blowing at 10-30kph, which can create choppy conditions. For the best sessions, watch for days when the swell aligns with lighter ENE-E winds or rare offshore wind windows. Bigger days (2m+) usually arrive with S to SSE swells but may come with stronger onshore winds. Overall, November delivers solid waves but demands patience for clean conditions.