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Conditions at Seal Beach in September
September: First Cracks in the Summer Pattern
September remains more summer than autumn, but the first hints of change appear. Swell heights still average 2-3ft (0.8m), period a strong 13.6s, and the direction mix is still dominated by SW 43.7%, WSW 26.6%, and SSW 24.3%. Ideal wind climbs to 7%, and the onshore machine starts to weaken slightly: WSW 25.4% and SW 21.1% remain, but there are also light NE/ENE/SE breezes more often. The combination of long-period SSW/SW swell and slightly lighter mornings can occasionally produce clean, fun 2-4ft (0.6-1.2m) waves - especially if a late-season hurricane or tropical storm passing well to the south adds energy. In general, expect continued small surf and tricky afternoon texture, but the quality trend is finally upward. Water temp peaks at 18.5°C, air temps average 20.7°C, and rainfall is a negligible 0.10 mm/day.
Average Spot conditions at Seal Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Seal 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 Seal Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Seal 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 Seal Beach.