Conditions at San Juan in August
August: Hurricane Season Tension
August is still locked in the summer trade-wind pattern, but the tropics begin to stir. Average swell is 2-3ft (0.8m) and the period drops to 5.9s, the shortest of the year. ESE (49%) and E (44%) continue to dominate, with only a whisper of SE/SSE energy, mostly in the small range. That means San Juan is still starved for quality swell direction, though the first tropical waves and distant hurricanes can occasionally throw more organized 3-5ft (1-1.5m) lines onto the coast.
Winds are side-shore from the E at 47%, with ESE (27%) and ENE (15%) filling the gaps. Ideal conditions remain scarce at 22%. Air temperatures are at their peak around 27.9°C, water is 28.8°C, and rain increases to 4.49mm/day. Keep an eye on the tropics: if a storm tracks far enough north or west, the angle might finally offer something with a bit more power, but usually August is a small, bumpy grind.
Average Spot conditions at San Juan in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at San Juan during August. 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 August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Juan for August. 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.