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Conditions at Isla Chepillo in September
September: The Autumn Swell Ramp-Up
September sees the highest percentage of 0.5-1m waves so far, at 20.2%, with 0.1% reaching 1-1.5m (3.3-5ft). The average height is still 0.4m (1.3ft), but a longerboard-friendly wave becomes noticeably more common. The swell direction is locked in from the SSW, representing 99.9% of the spectrum. The average period, however, is only 8.5s, so it is more windswell and local pulse than powerful groundswell. Onshore south winds are at their strongest of the wet season: S, SSW, SW and WSW directions combine for 39.7%, while offshore flow is down to around 11%. This explains why ideal surfing conditions are only 3%. Rain is also at its peak, with 8.03mm/day. Air temps average 26.9°C and water temp is 29.0°C, so it is humid, warm and occasionally grovelable.
Average Spot conditions at Isla Chepillo in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Isla Chepillo 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 Isla Chepillo for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Isla Chepillo 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 Isla Chepillo.