Conditions at Guethary in September
September: The Atlantic Rearrives
September is when Guethary starts to wake up. The average wave height climbs back to 3-4ft (1.1m) and the period lengthens to 10.6s - a crucial sign that real groundswell is returning. NW remains the heavyweight at 53.8%, with WNW on 33.3% and NNW 8.3%. More importantly, the height distribution is shifting upward: the 3-5ft (1-1.5m) class is fully loaded, and the first 5-8ft (1.5-2.5m) sets of the autumn are beginning to appear.
Wind quality rises to 29% ideal. N/NNW/WNW winds remain (NNW 13.1%, W 12.0%, WNW 11.4%, NW 10.6%), but the southern and southeastern sectors are steadily increasing, which means more windows of clean, offshore surface. Water temp is still warm at 21.0°C and air temp is 19.0°C, so you can surf this transitional energy in a spring suit. September offers the best mix of warm water and returning swell all year.
Average Spot conditions at Guethary in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Guethary 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 Guethary for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Guethary 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 Guethary.