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Conditions at Black Rock in September
September: Spring Swing and a Return to Mixed Swells
September marks the beginning of the spring transition. Average swell height eases to 5ft (1.6m), average period drops to 8.8s, and the true W/SW swell supply is cut back to around 8.9 percent. The swell rose is now led by S (16.5 percent), SSE (16.4 percent) and NE (12.3 percent), showing a broadening of sources and a gradual retreat of the winter storm track. The wind picture is a mixed bag: NNE totals 10.8 percent, NNW 10.9 percent, W 9.7 percent and WNW 9.3 percent, with the ideal-wind score improving to 26 percent. Water temperature begins to climb from the winter minimum to 17.2°C. September is more about punchy S/SSE groundswell on cleaner surfaces than about powerful westerly groundswell. It is a solid, consistent month, but the magic of winter is already fading.
Average Spot conditions at Black Rock in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Black Rock 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 Black Rock for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Black Rock 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 Black Rock.