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Conditions at Pennington Bay in August
August: Peak Swell of the Year
August brings Pennington Bay's highest average swell height of the year at 2.0m (6.6ft), driven by a mature Southern Ocean storm track. Periods are at 12.2s, so the energy arrives with serious depth and power. Offshore wind frequencies are still excellent at 26%, headed by NNW 15.5%, WNW 9.9% and NW 9.7%. The onshore SE/SSE/S share drops to around 12%, meaning the late winter pattern frequently lines up with clean, offshore conditions.
Swell direction tells a familiar story: SW 33%, SSW 17% and WSW 14%, with only a small direct-south component. Still, the long periods help the southwest groundswell bend around Kangaroo Island's coastal structure, delivering hefty, chunky waves to the bay. This is the month for experienced surfers on bigger boards, especially when the wind swings NW behind vigorous fronts. Water temperature reaches the winter minimum of 14.7°C, air averages 12.8°C, and rain remains substantial at 2.13mm/day.
Average Spot conditions at Pennington Bay in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Pennington Bay 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 Pennington Bay for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Pennington Bay 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 Pennington Bay.