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Conditions at Boulevard in September
September: Longest Periods of Summer
September is arguably the sweet spot. Average wave height climbs slightly to around 2.5-3ft (0.7-0.9m), and the average period jumps to 10.1s, the first month of real long-period potential. ENE (40%), NE (26%) and E (17%) combine to fill the east-facing beach with more organized lines. Wind remains favorable, with WSW (12%), W (12%), SW (13%) and WNW (7%) keeping the surface clean; ideal wind peaks at 59%, the highest all year. The growing typhoon frequency in the western Pacific can deliver overhead sets during this month, especially when a distant tropical cyclone pumps long-period ENE swell while the southwest monsoon keeps the wind offshore. Air temp averages 28.0°C, rainfall is 7.15mm/day, and water temperature is 29.3°C.
Average Spot conditions at Boulevard in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Boulevard 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 Boulevard for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Boulevard 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 Boulevard.