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Conditions at Yumuri in September
September: A Quiet Eye Before the Autumn Storm
September is one of the smallest months of the year at Yumuri, with average heights dropping to 2ft (0.7m) despite the period ticking up slightly to 6.5s. ENE swell still accounts for 73% of the data, but much of it is tiny: 15% falls into the 1.5ft (0.5m) or less micro category and 44% in the 2-3ft (0.5-1m) range. The strong 20-40kph ENE winds that plague midsummer also ease back, which is good for surface texture but not for wave size. This month actually sees some south-component swell creep in from tropical activity, but it is mostly small and far from the exposed north-facing beach. Ideal wind is 9%, water temperature peaks at 29.0°C, air temps hit 28.2°C, and rainfall increases to 3.16mm/day. September is the calm before the autumnal Atlantic storm track gets going.
Average Spot conditions at Yumuri in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Yumuri 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 Yumuri for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Yumuri 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 Yumuri.