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Conditions at Oceanside in August
August: The Doldrums of Small Swell and Westerly Wind
August is the smallest month of the year at Oceanside, with the average swell height dropping to 0.9m (about 3ft). Swell direction still works in your favor - SW at 45.9%, WSW at 30.4%, and SSW at 16.5% - but the height distribution is heavily weighted toward 2-3ft (0.5-1m) surf. The average period of 13.6s means there is still genuine long-period energy in the water, yet it rarely builds into anything substantial. This is groveling territory.
Wind quality remains poor, with ideal offshore flow at only 5%. W winds are dominant at 28.1%, WSW contributes 18.0%, and WNW adds 18.1%, creating persistent bump and cross-onshore texture. Water temp peaks around 18.7°C (65.7°F), with air temps at 21.6°C (70.9°F). For beginners or longboarders, the soft 2-3ft reform can be fun, but anyone looking for power will have to wait for autumn.
Average Spot conditions at Oceanside in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Oceanside 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 Oceanside for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Oceanside 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 Oceanside.