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Conditions at Grumari in September
September: Spring Onsets and Fading Winter Swell
September is a tale of two seasons. The swell still has plenty of size, with average height climbing to 4.3ft (1.3m) and period at 10.5s, but wind quality backs off noticeably as ideal wind drops to 37%. S (29.3%) and SSE (26.5%) continue to dominate, followed by SE (19.5%) and ESE (16.2%), with a notable 6.7% from SSW. The 3-5ft (1-1.5m) range is still well represented, and there is plenty of 5-6.5ft (1.5-2m) groundswell in the mix. The problem is wind: E (13.8%) and ENE (14.3%) trades are strong, pushing the ocean into bumpy, cross/onshore conditions much of the time. Rain starts increasing again at 3.04 mm/day, air temperatures are mild at 21.7°C, and water temperature is 20.6°C.
Average Spot conditions at Grumari in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Grumari during September. 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 September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Grumari for September. 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.