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Conditions at Petacalco in September
September: Peak Tropical Swell and Transition
September is historically the apex of the Eastern Pacific tropical storm season, and Petacalco feels it. The average swell height peaks for the year at 1.5m (4.9ft), with periods at 12.9s. SSW still leads at 65.1%, S contributes 21.5%, and SW adds 10.9%. This month holds the highest percentage of larger surf, with around 27% of waves in the 1.5-2m (4.9-6.6ft) range and nearly 6% in the 2-2.5m (6.6-8.2ft) range. The caveat is the wettest month of the year: 7.65mm/day of rain, 42% ideal wind, and strong onshore SSW/SW wind can make the bigger days stormy. Search out the post-storm windows with northwesterly offshore breezes and you will be rewarded with heavy, firing sandbar waves.
Average Spot conditions at Petacalco in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Petacalco 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 Petacalco for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Petacalco 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 Petacalco.