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Conditions at Grumari in August
August: Late Winter, Still Plenty of Punch
August continues the winter run, though the trade winds start to creep back. Average wave height remains 4ft (1.2m), average period stays solid at 10.8s, and ideal wind drops slightly to 47%. S (31.8%) and SSE (25.2%) remain the primary swell directions, with SE (18.6%), ESE (13.1%) and SSW (9.1%) adding variety. The 3-5ft (1-1.5m) range dominates, while S and SSW provide meaningful 5-6.5ft (1.5-2m) surf and a solid 6.5-8ft (2-2.5m) contribution. Wind data show ENE (12.7%), NNE (12.9%) and E (11.2%) strengthening, but the SW flow still gives enough texture that 47% of conditions are ideal. With only 1.41 mm/day of rain, the driest month of the year, air temperatures around 20.7°C, and water temperature at 21.0°C, the waves are still well worth chasing.
Average Spot conditions at Grumari in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Grumari during August. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Grumari for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Grumari for August. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Grumari.