Conditions at San Juan in May
May: The Cleanest Month of the Year
May is San Juan's most favorable wind month in the statistical record, with ideal surf conditions 40% of the time. The trades ease their grip and the wind rose shows a more balanced mix: E (33%), ESE (33%), SE (13%) and SSE (4%). Swell is dominated by ESE at 64% and E at 20%, with the height concentrated in the 2-3ft (0.5-1m) range; about 11% of the waves reach 3-5ft (1-1.5m). The period still sits at 6.0s, so 'good' means clean and rippable rather than powerful.
This is the final month before the summer wind machine really kicks in, and S/SW windows become more common, occasionally offering true offshore texture. Air temperatures are warm (26.8°C), water has climbed to 27.5°C, and daily rainfall jumps to 4.55mm. A classic late-spring setup: small, but consistently the most fun San Juan will offer all year.
Average Spot conditions at San Juan in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at San Juan during May. 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 May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Juan for May. 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.