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Conditions at Cloud 9 in September
September: The Tides Are Turning
September is a serious transition month and the start of the classic Cloud 9 window. Average size is still modest at 2-3ft (0.8m), but the period stretches back to 9.5s, and the swell direction shifts north-NNE jumps to 11% and true N appears again at 2%, while NE leads at 27% and ENE adds 23%. These extra north components bring more open-ocean fetch and often the first organized groundswell of the late season. The wind is outstanding: ideal offshore flow sits at 57%, with S/SSW/SW/WSW directions dominating and the persistent NE trades subdued. This combination of clean offshore wind and early long-period pulses makes September one of the most reliable quality months, even if the average height does not look impressive. When a typhoon sets up northeast of the Philippines, Cloud 9 can turn hollow and intense. Air and water temperatures are 28.0°C and 29.5°C, with 6.3mm/day of rain.
Average Spot conditions at Cloud 9 in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cloud 9 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 Cloud 9 for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cloud 9 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 Cloud 9.