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Conditions at The Alley in September
September: Spring Onshore Return
September is the hinge month when the winter quality window starts to close. Average swell size remains 0.9m (3ft), but period drops to 7.8s and ideal wind percentages fall to 39 percent. The swell origin shifts too: NNE (12.7%), NE (11.5%), and ENE (12.8%) become major contributors alongside E (20.7%) and ESE (17.2%). NNW wind dominates at 20.8%, not offshore for The Alley, and the secondary S/SSE winds aren't enough to keep the surface clean. Air temps warm to 20.0°C, water temps rise to 20.5°C, and rainfall is low at 1.20 mm/day. September can still be fun when a strong front swings the wind through the W/SW quadrant, but the daily trade-wind background noise is creeping back.
Average Spot conditions at The Alley in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at The Alley 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 The Alley for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at The Alley 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 The Alley.