Conditions at Playa de San Juan in September
September: The First Autumn Pulse
September marks the beginning of the autumn transition. The average swell height is still modest at 1.2m (4ft), but the average period jumps back up to 9.5s, giving the waves a cleaner feel. The swell directions are perfectly in the surf window - N at 30.5%, NNE at 31.9% and NNW at 31.1% - and there are occasional 1.5-2m (5-6.5ft) sets from the N and NNE. Early autumn lows can send the first real groundswell of the season.
Winds are still predominantly onshore, though. NNE flow is at 50.3%, with N at 16.2% and NNW at 12.9%, while ideal offshore wind creeps up to just 4%. Air temperatures average 22.9°C, water 22.7°C, and rainfall remains low. It is a shoulder month for the dedicated surfer; you can get fun waves if you are picky.
Average Spot conditions at Playa de San Juan in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Playa de San Juan during September. 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 Playa de San Juan for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Playa de San Juan for September. 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 Playa de San Juan.