Conditions at Amoreira in September
September: Early Autumn Reinforcements
There is a noticeable shift as the Atlantic wakes up from summer. Average surf height rises to 5ft (1.5m) and the average period lengthens to 10.6 seconds. NW swell still dominates at 52.7 percent, with NNW at 19.0 percent and WNW at 16.5 percent. The longer period is the key: waves become more organized and more powerful than the summer windswell. Ideal wind percentage jumps to 18 percent, and while NNW winds still blow 36.4 percent of the time, the lower sun angle and more frequent passing fronts create better clean windows. Water temperature is around 18.3°C, air averages 21.3°C, and precipitation is still low. September often delivers the first true autumn swell of the season, making it a hidden gem for quality before the full winter crowds arrive.
Average Spot conditions at Amoreira in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Amoreira 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 Amoreira for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Amoreira 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 Amoreira.