Conditions at Ericeira in September
September: The First Whiff of Autumn
September is where the magic starts to return. Average swell height climbs to 1.6m (around 5ft) and the average period jumps back to 10.5s - just enough to get the reefs drawing again. The swell direction is still heavily NNW and NW, but the percentage of W and WNW groundswell increases, signaling the first autumn swells from North Atlantic lows. Wind quality improves too: ideal offshore flow from the NE through ESE is present 16% of the time, a big jump from mid-summer. Water is still warm at 18.2°C, air temps remain pleasant around 19.8°C, and rain is limited. September often produces clean, glassy 4-6ft (1.2-1.8m) waves on the points, making it one of the best-kept secrets of the Ericeira calendar.
Average Spot conditions at Ericeira in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Ericeira 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 Ericeira for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ericeira 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 Ericeira.