Rosa - surf spot statistics

Best Surf Season (May - August)

During the austral winter, Rosa comes alive as the South Atlantic storm track shifts northward, delivering a consistent stream of medium to long-period swell from the E/ESE/SE quadrant. Average wave heights hover in the solid 1.3-1.4m range with periods frequently pushing 9-10 seconds, creating punchy, rippable waves. The real key, however, is the wind. From May through August, the percentage of ideal offshore flow from the WSW-WNW sector peaks at 50-56%, cleaning up the faces and offering glassy conditions more often than not. This is prime time for Rosa, when the combination of reliable swell and favorable synoptic patterns produces the most consistent quality surf.

Fair Surf Season (April & September)

April and September serve as the transition windows into and out of winter. In April, the offshore wind frequency climbs to 40%, and average swell periods edge up to 9.0s, hinting at the approaching winter energy. September still sees solid 1.5m average swell – the highest of the year – but the wind becomes less reliable, dropping to 31% ideal. These months offer plenty of rideable days, but you may need to pick the right weather windows to avoid onshore chop.

Low Surf Season (October - March)

From late spring through early autumn, Rosa endures its least consistent period. The South Atlantic storm track shifts poleward, reducing swell energy and period. Average wave heights sit around 1.2m with periods mostly below 8.5s. More critically, the dominant wind regime shifts to the NNE-ENE sector, which blows directly onshore at this east-facing beach. Ideal offshore wind percentages drop to 23-32%, meaning many days are marred by bumpy, choppy conditions. While occasional pulses of swell can still produce fun waves, the overall reliability is low, and patience is a virtue.

October: Unsettled Transition

October marks a return to spring instability. Average swell height is 1.4m, period at 8.6s – still decent but trending downward. Swell is predominantly from the E (26.3%) and ESE (19.3%), with ENE (19.8%) also present. The wind turns more onshore again: ideal offshore wind is only 25%. NNE (24.1%) and NE (19.2%) winds dominate, frequently ruining wave faces. Storms can still generate solid pulses of swell, but the accompanying winds often change directions quickly. Score clean conditions by picking windows with a strong westerly component, but be ready for chop.