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Conditions at Seal Beach in August
August: Peak Summer, Persistent SW Wind
August mirrors July: consistent southern hemisphere groundswell, absolutely dominated by onshore wind. The average height is 2-3ft (0.8m) with a 13.7s period, and the swell directions break down as SW 45.3%, SSW 27.2%, WSW 23.0%, with a bit more S at 1.8%. While those SSW/SW lines are optimal for the beach, the accompanying wind is not. Ideal conditions sit at 1%, and the wind rose shows WSW 27.4%, SW 28.4%, SSW 18.2% and S 12.5%. The sea breeze arrives early and stays late, flattening and lumping the lines. Very occasional summer pulses from a Southern Hemisphere storm can spawn 3-5ft (1-1.5m) SSW swell, but without a north wind or a rare NE eddy event, the surface conditions will struggle. Water temp is at a warm 18.1°C, air temp averages 20.9°C, and dry conditions (0.03 mm/day) mean no runoff to build sandbars.
Average Spot conditions at Seal Beach in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Seal Beach during August. 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 August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Seal Beach for August. 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.