Conditions at Almagreira in September
September: First Signs of Autumn Groundswell
September is the turning point. Average swell height climbs back to 5-6ft (1.7m), average period lengthens to 10.5s, and the first true Atlantic groundswells of the autumn begin to show on the charts. The swell direction is still overwhelmingly from the optimal NNW/NW/WNW window - 33.1%, 33.5% and 15.5% respectively - and the 5-6.5ft (1.5-2m) and 6.5-8ft (2-2.5m) bands start to fill out again. Almagreira starts to regain its shape and punch.
Wind is still a huge factor, with NNW wind dominating 34.2% and ideal offshore flow only 14%, but the increased period and size mean more waves make it through cleanly. With water temp at 18.7°C, air at 19.3°C, and only 1.08 mm/day of rain, early autumn offers a decent trade-off: warm water, building swell, and an improving chance of glassy conditions as the first southerly wind events develop.
Average Spot conditions at Almagreira in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Almagreira 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 Almagreira for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Almagreira 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 Almagreira.