Conditions at Biarritz in September
September: Autumn's First Salvo
September is when Biarritz wakes from its summer sleep. Average swell height jumps to 4ft (1.1m) and period lengthens to 10.6s. Direction remains a near-perfect NW/WNW mix - NW 53.8 percent, WNW 33.3 percent, NNW 8.3 percent. The most noticeable change is in the tail of the distribution: 3-5ft (1-1.5m) waves make up nearly 29 percent, 5-6.5ft (1.5-2m) pushes past 10 percent, and the first 6.5-8ft (2-2.5m) pulses appear.
The wind is ideal 29 percent of the time, up from the summer doldrums. Although NNW (13.1 percent), W (12.0 percent), WNW (11.4 percent) and NW (10.6 percent) still dominate, southern quadrant offshore flow (S, SSW, SW, WSW) is on the rise. Water temp remains warm at 21.0°C and air averages 18.9°C. It is a transition month, but one that can produce excellent waves when the first autumn low lines up.
Average Spot conditions at Biarritz in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Biarritz 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 Biarritz for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Biarritz 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 Biarritz.