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Conditions at Long Beach in September
September: The Turning Point
September is the standout transition month in the Long Beach calendar. The average wave height is 4ft (1.2m), but the average period jumps to 8.4s - the highest of the year - meaning the quality per wave is noticeably better. Swell energy is spread across the southeast: ESE delivers 19.5%, SE 17.4%, SSE 13.9%, and E 14.8%, with S adding another 9.4%. These directions are ideal for generating clean, groomed lines when a hurricane or tropical system aligns with the western Atlantic. Even the local windswell tends to have more shape as the ocean starts to cool.
Wind conditions improve, too. N and NNE combine for 8.3%, and NNW adds 9.5%, while the S/SSW flow weakens to 18.4%. Ideal surf wind reaches 31%, the best of the year. Water temperature remains warm at 21.2°C, air averages 20.2°C, and precipitation is 3.39 mm/day. This is a magic month at Long Beach - warm water, clean winds, and the return of real Atlantic energy.
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.