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Conditions at Pennington Bay in September
September: Big Swell, Shifting Winds
September is still a high-performance month, but the meteorological gears start to shift. The average swell holds at 2.0m (6.6ft) with a 12.2s period - equal to August for power. The wind is now more variable: ideal offshore flow still arrives 24% of the time, but the SW and WSW wind share increases as the spring westerlies begin to intrude. Onshore ESE/SE/SSE/S flow is still moderate at 17.5%, so there are plenty of good windows, but the clean post-frontal windows can be shorter-lived.
The swell window turns even further to the southwest, with SW at 39% and SSW at 21%, while WSW contributes 11%. These are long-fetch Southern Ocean swells with plenty of intensity, but they arrive at a less favorable angle than the direct S/SSE swells that suit Pennington Bay best. Water temperature is still cold at 14.8°C, air averages 13.5°C, and rain eases to 1.77mm/day. Score a morning with light N/NW winds and you will find some of the most powerful waves of the season.
Average Spot conditions at Pennington Bay in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Pennington Bay 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 Pennington Bay for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Pennington Bay 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 Pennington Bay.