Ferrugem - surf spot statistics

Ferrugem in Brazil offers consistent surf year-round, but the best conditions typically occur between May and September. During these months, the swell is predominantly groundswell (peaking at 42% in May and June), which provides cleaner, more powerful waves compared to the windswell-dominated conditions in other months. Mean swell size also increases slightly, averaging around 1.6-1.7m, with May to August delivering the most reliable wave heights. Wind conditions, however, remain challenging throughout the year, with bad winds (onshore or cross-shore) dominating over 70% of the time. The least unfavorable winds occur from May to July (25-26% good wind days), though even then, clean conditions are relatively rare. September stands out with the largest average swell size (1.9m) but suffers from the worst wind conditions (only 14% good wind days). From October to April, the surf is smaller and more windswell-driven, with January, February, and December showing the weakest groundswell influence (16-19%) and the highest frequency of poor winds (79-87%). Overall, mid-year (May-August) provides the best compromise between swell quality and size, though surfers should be prepared for frequent onshore winds. Early mornings or sessions following wind shifts may offer brief clean conditions, but consistent offshore breezes are rare at this spot.

Ferrugem in September offers decent surfing conditions with an average swell height of 1.9m and a solid period of 9.5s, providing consistent, well-formed waves. The swell distribution shows the best wave energy coming from ENE to SSE, with the highest frequency of waves in the 1.5-2.5m range (peaking around 8.5% for S swells at 1.5-2m). Smaller swells (0.5-1.5m) are common but less ideal for advanced surfers, while bigger swells (over 2.5m) are rare but possible from S/SSE directions. Wind conditions are less favorable—only 14% of the time are they ideal, with NNE being the most problematic (often 10-30kph, sometimes stronger). Cross-onshore ENE or light ESE winds are better, though not guaranteed. Overall, September delivers solid mid-sized swells with occasional larger days, but wind inconsistency means patience is key for clean sessions. Experienced surfers will find the most potential in the mornings before winds pick up.