Conditions at Santo Amaro in September
September: The Calm Before the Roar
September is the standout shoulder month. Average swell edges back up to 5ft (1.5m) with a 10.5-second period, and the ideal wind frequency jumps to a year-high 56 percent. The north-west quadrant still rules-NW at 42.1 percent and NNW at 25.7 percent-but the longer wave periods indicate the first forerunners of autumn groundswell arriving from distant Atlantic storms. Water temperature is at its peak 18.4°C and air average 19.9°C, making the overall surf experience extremely pleasant. This is a month where consistency and quality intersect: the swells are not as violent as winter, but the offshore wind windows are frequent and reliable. The first southerly components of the season can also sneak in, setting up beautiful glassy peaks and the start of serious surfing again.
Average Spot conditions at Santo Amaro in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Santo Amaro 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 Santo Amaro for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Santo Amaro 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 Santo Amaro.