Conditions at Hondarribia in September
September: The Autumn Switch-On
September is the weather and surf changeover. Average swell height ticks up to 1.3m (4.3ft) and the period extends back into the 10.4s window-the first real long-period swells of autumn start to arrive. The wave rose still favors the northwest at 54%, with WNW at 21% and NNW at 15%, and the heavier 1-2m classes gain more share. These early autumn groundswells can produce fun, rippable waves at Hondarribia, especially when paired with a light offshore breeze.
Wind data shows a slight reduction in the north/northwest sea breeze influence. NNW drops to 12%, while W and WNW sit at 11% each. Ideal wind is around 33%, and the south/southwest flows are slowly returning as the Iberian high weakens and Atlantic lows start coming back. You will find more clean mornings than in July and August, and a better chance of punchy 1-1.5m (3-5ft) surf.
Water temperature is still pleasant at 20.9°C, air averages 19.0°C, and rain increases to 2.59 mm/day. For many, September is the hidden gem of the year: warm water, autumn swells, and summer crowds starting to fade.
Average Spot conditions at Hondarribia in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Hondarribia 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 Hondarribia for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hondarribia 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 Hondarribia.