Conditions at Mareta in September
September: Autumn Returns With Better Period and the Year's Best Wind
September is the classic sleeper month in the Algarve. Average swell height is only 5ft (1.5m), but period rebounds to 10.4s and the right wind window is more consistent than any other month - the ideal wind score jumps to 35%. Swell direction still favors NW (47.1%), NNW (25.5%) and WNW (14.3%), but the extra period and lighter offshore winds from NNW (46%), NW (12.2%) and N (5.2%) make it one of the most user-friendly waves of the year. Water is still warm at 19.3°C, air averages 21.0°C, and rainfall is modest at 0.75mm/day. A longboard or a fish will be your best friend, but when a distant south or south-southwest groundswell arrives, September can genuinely deliver.
Average Spot conditions at Mareta in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Mareta 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 Mareta for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mareta 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 Mareta.