Conditions at Playa del Castillo in September
September: Autumn Return Begins
September is one of the most underrated months at Playa del Castillo. Although average swell height is still a modest 4.6ft (1.4m), the period climbs back to 10.0s, signaling the first arrivals of longer-period autumn swell. The direction is still dominated by NNW (57.4%) and N (21.0%) with NW at 9.8%, so the window is not perfectly aligned, but the extra period gives the waves more shape and power. The wind field also improves: ideal wind jumps back to 23%, with NNE at 49.0% but lighter northern gradients compared to the heart of summer. It's a great month for a log or mid-length, and the first early-autumn Atlantic lows can send a fun NW swell in before the winter machine fully reengages. Water remains warm at 23.5°C, air averages 23.0°C, and rainfall is just 0.16mm/day.
Average Spot conditions at Playa del Castillo in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Playa del Castillo 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 del Castillo for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Playa del Castillo 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 del Castillo.