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Conditions at Yallingup in September
September: Spring Swell With a Southern Edge
September is the last full month of true winter energy, and the Indian Ocean is still delivering. Average swell height is a stout 8.5ft (2.6m) with a 13.2s period, and WSW swell remains prominent at 15.9 percent alongside SW's 28.4 percent. Westerly and WNW energy is still present, giving Yallingup a good mix of direct and refracted swells. The waves tend to be powerful, well-organised groundswell, and the occasional offshore day produces some of the cleanest big-wave sessions of the season.
Wind quality starts to improve as spring's transition begins. The ideal offshore window climbs to 19 percent, and while W/WSW/WNW winds still dominate the rose, SE/SSE flow is more consistent than in midwinter. Air temperatures remain cool at 15.4 degrees C (min 10.1, max 21.2), water temperature is 17.5 degrees C, the coolest of the year, and rainfall drops to 2.39mm/day. A good wetsuit is essential, but the reward is thick, powerful surf with fewer crowds than the coming summer months.
Average Spot conditions at Yallingup in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Yallingup during September. 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 September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Yallingup for September. 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.