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Conditions at The Dunes in September
September: Spring Shuffle
September is a transition month where the ocean still remembers winter but spring is beginning to push in. The average swell height remains an excellent 2.7m (8.9ft), with periods at 12.1s - still powerful. SW is the dominant direction at 17.8 percent, but SSW rises to 11.0 percent and WSW remains strong at 9.7 percent. The favorable W and WNW windows add another 3.5 percent, so the raw ingredients are still there for great surf.
Wind becomes the limiting factor. Ideal offshore conditions drop to 16 percent, with SSE at 18.2 percent and SE at 16.4 percent, but S winds at 9.5 percent and a mix of NW/NNW at 9.5 and 10.7 percent. This makes the weekly forecast more important. Catch a morning with a light ESE/SE flow and a fading W/SW groundswell, and The Dunes will still show its winter-trained power. Water temp begins to rise slightly to 15.5C, and rainfall eases to 1.30 mm/day.
Average Spot conditions at The Dunes in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at The Dunes 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 The Dunes for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at The Dunes 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 The Dunes.