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 November, Grumari offers moderately consistent surf with an average swell height of 1.5m and a decent period of 9.5s, providing decent energy for intermediate to advanced surfers. The swell predominantly comes from the E, ESE, SE, SSE, and S directions, with the most significant waves (1.5m+) frequently arriving from the E and S quadrants—these swells generate the best conditions, especially when accompanied by lighter winds. Wind conditions are mixed; while only 18% of winds are ideal (likely offshore or light cross-shore), ENE to ESE winds are the most common, often blowing at 10-30kph, which can create choppy or textured conditions. However, when winds swing SE or SSE at lower speeds, the lineup can clean up nicely. Larger waves (2m+) are most likely on S swells but remain relatively rare. Overall, November presents surfable waves, though wind interference limits perfect sessions—timing early mornings or wind shifts will be key for quality rides.