Map
San Juan - surf spot statistics
San Juan seasonal overview
Best Surf Season (May & September - October)
During these months, the percentage of offshore or light wind conditions peaks, offering the cleanest surfaces despite the small easterly swell. The average wave height hovers around 0.7-0.8m with periods of 5.9-6.1s, making for fun, groveling conditions on log-style equipment. Although the swell direction remains unfavorably from the east, the lighter winds allow for a decent rideable wave, especially at mid-tide.
Fair Surf Season (November - April)
Winter and early spring bring slightly larger average swell heights (0.8-0.9m) thanks to distant North Atlantic storms, but the dominant easterly wind regime often kicks up onshore chop. Only about 20-25% of the time do we get favorable winds, making it a gamble. The infrequent cold front passage can deliver a brief window of north-northwest swell and southerly offshore winds, but those days are rare and require careful timing.
Low Surf Season (June - August)
Summer sees the strongest easterly trade winds, blowing directly onshore and creating bumpy, messy conditions. Swell remains small (0.8-0.9m) and dominated by short-period easterly energy. With ideal wind percentages dropping to 18-22% in July and August, this is the slowest period for quality surf. June offers a slight uptick in favorable wind, but overall it's a time for small waves and wind protection strategies.
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Conditions at San Juan in July
July: Peak Trade Winds and Smallest Swell Quality
July is the most challenging month for surf quality. Average swell height is 0.9m with a period of 6.0s, but the direction is heavily from E (45%) and ESE (53.5%). Wave heights cluster in the 0.5-1m range (79% of total). The ideal wind percentage plummets to 18%, the lowest of the year. Greedy trade winds blow from the east: E (55.2%) at 10-20kph, often reaching 20-30kph (14.9%). This onshore flow creates messy, choppy surf with poor shape. The rare southerly wind window is almost nonexistent. July is a month to seek alternative spots or take a break from the lineup at San Juan.
Average Spot conditions at San Juan in July
Swell history for July
Wind history for July
Swell quality
Analyze the groundswell consistency at San Juan 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 San Juan for your next trip in July.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Juan 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 San Juan.