Conditions at Piha in September
September: Spring Swell vs the Westerly Grip
September is a study in contrasts at Piha. The average swell is still a heavy 6ft (1.9m), the period stretches to 13.1s, and the swell direction histogram is led by WSW at 32.9% over SW at 31.2%. That deep, long-period energy creates big and powerful waves, including 8ft+ (2.5m+) sets. Yet the offshore wind window shrinks to only 16%, because spring storm tracks pile low pressures onto the west coast. The ocean often looks raw, with westerly winds and bumpy surfaces. Only when a slow-moving high pressure blocks the westerlies does Piha reveal its true potential. Water temp starts to rise slightly to 14.3°C.
Average Spot conditions at Piha in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Piha 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 Piha for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Piha 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 Piha.