Conditions at Comporta in September
September: First Signs of Life
September is when the Atlantic stirs again. Average wave height is still small at 3.5ft (1.1m), but the average period climbs to 10.5 seconds, signalling the return of more organised swell. NW remains the dominant direction at 50 percent, with WNW at 32 percent, and there is a slight increase in W and SW energy. The first autumn cold fronts and occasional tropical remnants can send long-period swell toward Portugal, even if the statistics are not yet impressive. Ideal wind conditions improve slightly to 30 percent, but NNW wind still leads the wind table at 25 percent. Air temperatures are warm at 21.5°C, water temperature peaks at 18.3°C, and rainfall starts to increase. This is a transition month with the potential for clean, fun waves as summer patterns weaken.
Average Spot conditions at Comporta in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Comporta 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 Comporta for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Comporta 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 Comporta.