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Conditions at Gas Chambers in September
September: First Signs of Autumn Power
September is the turning point after summer. Average swell height nudges up to 3-4ft (1-1.1m), and the period jumps back to 9.1s. The swell distribution begins to broaden once again: NE 34.2%, ENE 33.6%, NNE 12.7%, with a few N and NNW pulses sneaking in. The extra period makes a big difference, helping the waves organize on the reef even at modest sizes.
Wind conditions are excellent, with ideal surf wind 66% of the time. This is one of the cleanest months of the year, especially if an early-season cold front or tropical system sends through a longer-period swell. Water temperature remains warm at 29.3°C, air averages 27.8°C, and September is the wettest month with 5.74mm/day. Persistence pays off this month.
Average Spot conditions at Gas Chambers in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Gas Chambers 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 Gas Chambers for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Gas Chambers 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 Gas Chambers.