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Conditions at Rottnest Island in August
August: Still Heavy, with a Taste of Spring
August holds onto the core of the winter swell window. Average wave height remains 9ft (2.7m) and the period peaks at 13.1s, the longest of the year. The directional distribution is again built around SW (31.9%) and WSW (14.2%), with solid W and WNW contributions plus a notable SSW component. Wind conditions are still good, with ideal surf conditions at 15%, though the offshore quadrant is less dominant than in June and July. ENE (6.3%) and E (6.3%) lead, while W/SW/WNW winds grow stronger and more common. This means more cross-shore or side-offshore westerly flow, and a mix of clean and wind-affected days. Rain eases to 3.66 mm/day, air temperature bottoms out around 15.6°C, and water temperature falls to its annual minimum of 19.5°C. August remains a prime month for long-period, powerful Rottnest waves, but you need to pick your sessions carefully around frontal passages.
Average Spot conditions at Rottnest Island in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Rottnest Island 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 Rottnest Island for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Rottnest Island 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 Rottnest Island.