Conditions at Rincao in September
September: Biggest Swell of the Year Meets Fickle Winds
September is the largest-swell month of the year at Rincao. Average heights climb to 5-6ft (1.7m) and the period sits at 9.4 seconds, with an even spread of ENE through S directions. The percentage of 5-8ft (1.5-2.5m) waves is at its highest, so there will be serious 6-8ft (1.8-2.4m) days when the Southern Ocean and South Atlantic lows align.
However, the wind becomes the main challenge. Ideal offshore flow drops to only 25 percent, while NE (20 percent) and ENE (15 percent) winds strengthen, often out of sync with the swell. Expect more lumpy, wind-affected surface conditions between frontal passages. Air temps are still cool at 17.6°C, water 17.3°C, and rain increases to 4.68mm/day. September is for experienced surfers chasing size on the better-bet offshore days.
Average Spot conditions at Rincao in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Rincao 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 Rincao for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Rincao 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 Rincao.