Conditions at Penarronda in September
September: First Sign of Autumn Swell
September is when Penarronda starts to wake up from its summer slumber. The average swell height rises to 3-4ft (1.1m), the period jumps back over 10s, and the first authentic low pressure systems begin to push swell down from the North Atlantic. NW and NNW remain the dominant directions at 35 and 34 percent, and there is a meaningful increase in the 3-5ft (1-1.5m) and 5-7ft (1.5-2m) bands. The surf is still not winter-sized, but it is more organized and powerful than anything the previous three months produced.
Ideal wind days improve to 31 percent, and S/SSW/SW flow begins to reappear more regularly. Water temperature is still warm at 18.7°C, air averages 17.6°C, and rainfall is moderate at 1.87 mm/day. The combination of warm water, building NW groundswell and lighter crowds makes September one of the best shoulder-season windows of the year.
Average Spot conditions at Penarronda in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Penarronda 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 Penarronda for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Penarronda 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 Penarronda.