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Conditions at Betty's Bay in September
September: Spring Swing - Size Remains, Winds Become Mixed
September is a transition month with a foot in both worlds. Average swell height is still substantial at 8.5ft (2.6m), and the period remains a healthy 11.9s. The winter offshore regime is fading, though: NW (14.1%) and WNW (11.1%) are still strong, but E (9.9%), ESE (11.5%) and SE (7.9%) are beginning to rebuild, dropping the ideal-wind percentage to 32%. Swell generation is still dominated by the Southern Ocean - SW (18.1%), SSW (10.8%) and WSW (9.6%) with a bigger W (3.1%) component - so long-period, powerful groundswell is far from done. The best windows come after cold fronts, when strong NW outflow and clean 8ft (2.4m) lines align before the springtime sea breeze kicks in. Air temps begin to rise to 14.7C, water is 15.4C, and rain eases to 1.74mm/day.
Average Spot conditions at Betty's Bay in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Betty's 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 Betty's Bay for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Betty's 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 Betty's Bay.