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Conditions at Cat Bay in September
September: Spring Light At The End Of The Tunnel
September is a transition month where the swell still has winter size but the wind begins to soften. The average swell height ties the annual max at 1.7m (5.6ft), and the average period stretches to 12.9s, the longest of the year. The dominant swell sources remain SW at 45.1% and WSW at 21.0%, with W at 6.6%, meaning long-period groundswell is the defining feature. The clean-window percentage improves to 24%, but NNW wind is still the largest single direction at 16.0%, while WSW, W and WNW winds also produce frequent cross and onshore chop. The good news is that cold fronts are becoming less aggressive and the southerly belts are shifting; morning S/SW wind episodes are more likely to hold. Water temperature is a frigid 13.1°C, but the surf-quality potential is real.
Average Spot conditions at Cat Bay in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cat 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 Cat Bay for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cat 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 Cat Bay.