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Conditions at Upper Trestles in June
June: Pure Southwest Swell, Party Crashed by Westerlies
June is a month of nearly perfect swell direction and frustrating surface texture. The average period is the longest of the year at 13.8s, the peak is around 3ft (1.0m), and the swell window is entirely within the Upper Trestles sweet spot: SW 38.8%, WSW 41.0%, SSW 7.8% and W 12.4%. These are long-period, organized Southern Hemisphere groundswells that can produce classic Lowers racetrack walls. Yet the ideal wind is only 9%, among the lowest of the year. Winds from WSW at 24.9% and SW at 18.5% dominate, with W adding another 13.2%, so afternoons are almost always bumpy. Water temp climbs to 16.0°C, air averages 19.3°C, and precipitation is nearly zero at 0.08 mm/day. The formula is simple in June: score the dawn patrol glass, or miss out.
Average Spot conditions at Upper Trestles in June
Swell history for June
Wind history for June
Swell quality
Analyze the groundswell consistency at Upper Trestles during June. 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 June.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Upper Trestles for June. 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.