Conditions at Arenillas in September
September: Autumn's First Pulse of Energy
September is the first sign of autumn. The average swell height climbs back to 4ft (1.2m) and the average period jumps to 10.4s, a welcome change after the summer slowness. The direction is still primarily northwest (NW 53.8%, NNW 21.9%, WNW 10.2%), but the key difference is the increase in the 1-1.5m range (20.2%) and a few bigger pulses in the 1.5-2m range (10.9%). There is now real push in the water as the Atlantic wakes up. The wind also begins to shift toward autumn, with the ideal wind percentage improving to 32%. Southerly and southwesterly winds start to appear (SSW 3.7%, S 3.8%, SW 3.0%), although E/ENE winds still remain common (E 9.9%, ENE 10.0%) and can spoil the surface. Air temperatures are a pleasant 19.5°C, water temp is 20.3°C, and precipitation is 2.04mm/day. September is a sweet transitional month: smaller than winter but with clean potential and warm water.
Average Spot conditions at Arenillas in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Arenillas 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 Arenillas for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Arenillas 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 Arenillas.