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Conditions at Long Beach in September
September: Spring's Cleaner Windows
September is one of the more reliable months for post-frontal conditions at Long Beach. The average swell height eases slightly to 8.9ft (2.7m), the period remains long at 12.1s, and the ideal wind percentage holds at 17 percent. Swell from SW at 17.8 percent, SSW at 11.0 percent and WSW at 9.7 percent continues to supply plenty of size, while the S sector at 6.5 percent adds a useful variety. Crucially, the onshore NNW wind has weakened to 8.4 percent and NW to 10.6 percent, while SE at 17.4 percent and SSE at 12.6 percent offshore winds regain dominance. This improves both wave shape and the odds of actually finding a clean line on the sandbars. Water temperature is still cool at 15.5C, air temps begin to warm to 14.9C, and rainfall drops to 1.30 mm/day.
Average Spot conditions at Long Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Long Beach 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 Long Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Long Beach 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 Long Beach.