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Conditions at Supertubes in September
September: Spring Shifts, Ocean Still Charging
September is the last of the real winter months. The average swell height is still 8.5ft (2.6m) and the period remains a strong 13.2s. SW (28.4 percent) and WSW (15.9 percent) are the dominant directions, with W at 3.5 percent. There is less WNW/NW energy than in May or June, but the raw Southern Ocean power is still very much in the water.
Spring is beginning to assert itself, however. Ideal offshore conditions tick up to 20 percent as high pressure becomes more frequent, and the wind rose is slowly shifting away from the hard midwinter W/NW pattern. The window between cold fronts can offer sunny offshore mornings after a fresh SW push. Air temp stays low at 15.4°C (10.1-21.2°C), water temp hits its annual minimum of 17.5°C, and rain is down to 2.39 mm/day. Still a very good surf month, just with more variables.
Average Spot conditions at Supertubes in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Supertubes 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 Supertubes for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Supertubes 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 Supertubes.