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Conditions at Upper Trestles in July
July: Peak Summer South Swell and a High-Cost Surface
July is the apex of Southern California summer surf, at least in direction. A massive 94% of the swell comes from the S-to-WSW window, with SW at 47.3%, WSW 29.8% and SSW 17.6%. Average height is 3ft (1.0m), and the period is an excellent 13.7s, so there is still legitimate long-period energy. But this is also the most wind-challenged stretch: ideal offshore wind remains at just 10%, and WSW at 28.8%, W at 18.5%, and SW at 16.9% rule the afternoons. The combination of clean 2-4ft (0.6-1.2m) southwest groundswell and onshore summer texture is the eternal Trestles summer tradeoff. Water temps rise to 17.7°C, air averages 22.1°C, and rain is essentially absent. Mornings, tides, and eddy winds are everything; if you catch a rare dawn clean-up, Lowers can absolutely light up.
Average Spot conditions at Upper Trestles in July
Swell history for July
Wind history for July
Swell quality
Analyze the groundswell consistency at Upper Trestles during July. 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 Upper Trestles for your next trip in July.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Upper Trestles for July. 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 Upper Trestles.