Grumari - surf spot statistics

Grumari, Brazil, offers surfable conditions year-round, but the best months for consistent surf are typically from April to July. During this period, ground swell frequency peaks (51-58%), providing cleaner, more organized waves, while wind swell remains moderate (41-52%). Mean swell size also increases to around 1.5-1.6m, offering better wave power. Wind conditions during these months are not ideal but manageable, with 25-30% of days having favorable offshore or light winds, though onshore winds dominate. The worst wind conditions occur from August to November, where unfavorable winds exceed 80% of days, often causing choppy surf despite decent swell. From December to March, wind swell dominates (63-69%), resulting in less consistent wave quality, though still surfable, especially when ground swell contributes. September stands out with the largest mean swell (1.7m) but suffers from the highest percentage of bad winds (85%). For the best balance of swell size, ground swell dominance, and less terrible wind conditions, May and June are the top months—offering a solid mix of wave energy and occasional clean conditions. Early mornings or late evenings may provide better surf due to lighter winds. Overall, intermediate to advanced surfers will find the most rewarding sessions in late autumn and early winter (April-July), while other months require patience with wind and swell variability.

In June, Grumari offers decent surf conditions with an average swell height of 1.6m and a solid period of 11.0s, indicating consistent, well-formed waves. The dominant swell direction is from the south (S, SSE), contributing to the majority of rideable waves, particularly in the 1-2.5m range, which accounts for nearly 40% of conditions. Stronger swells (2-2.5m) occur about 5.6% of the time, providing occasional punchy sessions for experienced surfers. Wind is a limiting factor, with only 30% of days offering ideal offshore or light cross-shore conditions. The wind is most frequently from the north and northeast (N, NNE, NE) at 10-30kph, which can create afternoon chop. However, lighter winds from the south (S, SSE) occasionally provide cleaner waves, especially in the mornings. Overall, June delivers reliable surf with a mix of medium-sized swells and occasional larger sets, though wind quality is inconsistent. Optimal sessions depend on timing when swell direction aligns with lighter winds—typically early mornings or during wind shifts. Experienced surfers can score quality waves, but patience is needed for the best conditions.