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Conditions at Gnaraloo in September
September: Power Remains, Cleanliness Fades
September is a late-winter/spring crossover. The average period is still an excellent 13.8s and wave heights remain around 5-6ft (1.5-1.8m), so the ocean still has plenty of push. However, ideal wind falls to 17% as the spring pressure gradient tightens and strong S/SSW winds-S 27.6%, SSW 22.1%-gain intensity. Swell is still overwhelmingly from the SW (65.6%) and SSW (25.9%), with a large chunk of 5-8ft (1.5-2.4m) energy. Gnaraloo in September is powerful but more challenging: often best early, before the southerly kicks in, and demanding on the bigger days. Water sits at its coolest, 21.9°C, air warms to 21.0°C, and rainfall is negligible at 0.17 mm/day. Size is not the issue in September-finding clean windows is.
Average Spot conditions at Gnaraloo in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Gnaraloo 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 Gnaraloo for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Gnaraloo 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 Gnaraloo.