Conditions at Cabedelo do Douro in September
September: The First Swell Pulses of Autumn
September is the bridge back toward autumn. Average swell height remains small at 3.6ft (1.1m), but the average period ticks up to 10.4s, and the first true long-period groundswell of the season becomes increasingly likely. Directionally, the ocean is still overwhelmingly from the west-to-northwest sector: WNW 42.0 percent, NW 39.3 percent and W 11.5 percent, a perfect match for Cabedelo's exposure.
Wind is still a limiting factor - favourable offshore conditions are only 26 percent - as the nortada (NNW 29.2 percent, NW 10.4 percent) lingers well into the month. However, synoptic patterns are shifting, and tropical/subtropical lows that start tracking toward Iberia can deliver clean, glassy sessions with warm air (19.2°C), warm water (16.8°C) and light offshore east winds. The energy is still small, but quality windows become more frequent, making September a genuinely underrated month for Cabedelo.
Average Spot conditions at Cabedelo do Douro in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cabedelo do Douro 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 Cabedelo do Douro for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cabedelo do Douro 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 Cabedelo do Douro.