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Conditions at Yallingup in August
August: Holding Pattern of Heavy Westerly Swell
August keeps the Southern Ocean machine running at full tilt. Average swell height remains a solid 9ft (2.7m), with the average period stretching to 13.3s, the longest of the year. The directional mix is similar to July, with SW still supplying 25.6 percent and WSW 14 percent, while W and WNW maintain a meaningful presence. Swell energy is not the issue; Yallingup is awash with powerful groundswell, and exposed reefs can be absolutely pumping with 6-10ft (1.8-3m) waves.
The limiting factor remains wind. Only 17 percent of the time is truly ideal for surfing, and W/WSW/WNW wind directions total over 31 percent, frequently creating onshore chop. The good news is that lighter SE/SSE winds begin to creep back compared to July. Air temperature sits at its winter minimum of 15.5 degrees C (min 10.3, max 20.2), water temperature bottoms out at 17.6 degrees C, and rainfall is still significant at 3.12mm/day. Keep an eye on the synoptic pattern: the days after a cold front, with high pressure rebuilding offshore, are your best chance for a clean August session.
Average Spot conditions at Yallingup in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Yallingup 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 Yallingup for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Yallingup 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 Yallingup.