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Conditions at Mossel Bay in September
September: Spring Returns with a Renewed Offshore Breeze
September is the first real sign that the clean season is coming back. The average swell remains a full 7.5ft (2.3m), but the period retreats slightly to 11.5s, and the wind score improves to 35 percent. Swell direction is split between SSW at 22 percent and SW at 22 percent, with a growing S and SE component adding variety. The bay still has plenty of winter power.
Synoptically, the spring transition means fewer long stretches of northerly onshore wind and more post-frontal S/SW flow. Air temperature averages 14.9°C, water temperature is 15.8°C, and this is one of the drier months at 0.94mm/day. If you want big, reasonably clean waves without the deep winter bite, September is your month.
Average Spot conditions at Mossel Bay in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Mossel 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 Mossel Bay for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mossel 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 Mossel Bay.