Conditions at Cortegaoa in September
September: The Turning Point
September marks the transition back to autumn. Average swell height climbs to 3-4ft (1.1m) and the period lengthens to 10.4s, while ideal wind conditions improve to 25%. The wave directions remain NW (39.3%) and WNW (42.0%), but there is more energy in the water - over a third of waves now exceed 1m. The wind still blows mostly from the north (NNW 31.1%, NW 10.0%), but the stronger sun means sea breezes can sometimes be offset by morning offshore easterlies. Water temperatures are still warm at 17.1°C (63°F), air temps average 19.2°C (67°F), and precipitation is starting to increase (1.92 mm/day). September offers a taste of the coming season: first real groundswells, warm water, and improving conditions.
Average Spot conditions at Cortegaoa in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cortegaoa 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 Cortegaoa for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cortegaoa 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 Cortegaoa.