Conditions at Zurriola in September
September: The Autumn Awakening
September is when Zurriola starts to stir from its summer slumber. The numbers show genuine improvement: average swell height climbs to 1.3m (4ft), the average period stretches back to 10.4s, and ideal wind conditions jump to 32 percent. The wave rose is still northern - NW 53.5, WNW 21.0, NNW 14.5 - but the energy in the water carries more push and shape. Late-season extratropical systems in the North Atlantic begin sending longer-period swell signals toward the Bay of Biscay, and the sea breeze gradually weakens. While the wind distribution remains northern (NNW 11.7, WNW 10.2, NW 8.6), southerlies return with more presence (S 7.7, SSW 4.6, SW 3.4, WSW 4.9), and cross-offshore SSE adds another 6.6 percent. The water is still warm from summer at 20.9°C and air temps are pleasant at 19.0°C. For many locals, this is the best quality-to-comfort ratio of the year: plenty of decent waves and warm water, with autumn just around the corner.
Average Spot conditions at Zurriola in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Zurriola 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 Zurriola for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Zurriola 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 Zurriola.