Conditions at Prainha in September
September: The Season Wakes Up
September is where the season starts to stir again. Average swell rises to 6ft (1.7m), the period climbs to 10.5s, and ideal wind time jumps to 22 percent. The wave rose is still heavily NW (33.5 percent) and NNW (33.1 percent), but the WNW (15.5 percent) and W (4.1 percent) contributions are starting to matter. Early Atlantic lows and occasional tropical remnants send more organized groundswell, allowing Prainha to produce clean head-high-plus waves by the end of the month.
Water is at its warmest at 18.7°C, air averages 19.3°C, and rainfall remains low at 1.08mm/day. While summer north winds still blow 40.4 percent of the time, September's longer-period swells and warm water combine to make it the most promising off-season month.
Average Spot conditions at Prainha in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Prainha 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 Prainha for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Prainha 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 Prainha.