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.

In May, Rosa in Brazil offers surfers consistent conditions with an average swell height of 1.7m and a solid period of 10.0s, indicating well-organized, powerful waves. The swell is predominantly from the S-SSE-SE-ESE-E directions, with the highest frequency of rideable waves (1-2.5m+) coming from the S and SSE. These directions provide clean, long-period swells, ideal for quality surfing. Wind conditions are favorable 24% of the time, with lighter winds (0-20kph) from the NE-E-ENE-ESE-SE directions, which are offshore or cross-offshore, helping to groom the waves. However, stronger onshore winds from the N-NNE and SSW-SW can occasionally degrade conditions. Overall, May delivers reliable waves for intermediate to advanced surfers, with the best sessions occurring when the swell aligns with lighter winds from the eastern quadrants.