Conditions at Foz do Arelho in September
September: First Signs of Autumn Fire
September is the bridge between summer mush and winter power. The average swell height creeps back to 5-6ft (1.7m), period lengthens to 10.5s, and the first North Atlantic lows begin to send more organised WNW, NW and NNW swell toward Portugal. The wind is still predominantly northerly, with NNW at 34.2 percent and N at 15.2 percent, but the 14 percent ideal wind score is a clear improvement over summer. When a slow-moving low drifts west of Ireland, Foz do Arelho can light up with clean, long-period waves and light S to SE airflow. Water temperature is at its warmest at 18.2C, air averages 19.3C, and rain increases to 1.08 mm/day. This is a great month for savvy surfers to get a jump on the season before October arrives.
Average Spot conditions at Foz do Arelho in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Foz do Arelho 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 Foz do Arelho for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Foz do Arelho 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 Foz do Arelho.