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Conditions at San Onofre State Beach in June
June: Summer South Swell Meets Onshore Flow
June marks the official arrival of summer south swell, and for a southwest-facing beach like San Onofre that is a double-edged sword. The average swell height is 3.3ft (1.0m), and the period is the longest of the year at 13.8s. The direction is near perfect: SW 39%, WSW 41%, and SSW 8% combine for 88% from the optimal window. In the water, you will find clean, long-period southern hemi lines - when the wind allows.
The when-the-wind-allows part is the catch. Ideal wind percentages bottom out at 6%, the lowest of the year. Onshore S through WSW winds account for 55% of observations, with another 20% from the W. This persistent sea breeze, driven by the thermal low inland, puts lump on the waves and closes out the afternoon session. Water temperature rises to 16.0°C, air temperatures average 19.3°C, and precipitation is nearly negligible at 0.08 mm/day. Keep expectations in check: the swell is real, but surfable wind is a rare early-morning commodity.
Average Spot conditions at San Onofre State Beach in June
Swell history for June
Wind history for June
Swell quality
Analyze the groundswell consistency at San Onofre State Beach 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 San Onofre State Beach for your next trip in June.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Onofre State Beach 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 San Onofre State Beach.