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Conditions at Roca Loca in September
September: Tropical Cyclone Season and Fickle Winds
September is the peak of Eastern Pacific tropical cyclone season, and that shows in the surf data. Average size is still 4-5ft (1.4m), but the period backs down slightly to 13.0 seconds. The swell mix becomes more westerly: SSW is 84.0 percent, SW jumps to 14.6 percent, and even a hint of WSW shows up. That pushes more energy into the optimal direction for Roca Loca. However, this is also the worst month for wind, with ideal offshore flow only happening 24 percent of the time, the lowest of the year. Rainfall is heavy at 8.68mm/day, and air temperatures cool slightly to 25.5°C. Water temperature is 28.8°C. If a tropical storm or hurricane tracks far enough offshore, Roca Loca can suddenly go from average to firing with long-period SW swell, but persistent onshore winds often keep the surface rough.
Average Spot conditions at Roca Loca in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Roca Loca 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 Roca Loca for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Roca Loca 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 Roca Loca.