Conditions at Leblon in September
September: Last Big Swell of the Season, Trade Wind Battle
September is a hinge month: average swell height is still 1.5m (5ft) with a 10.5s period, making it nominally one of the biggest months of the year. The direction mix broadens, however, with ESE (18.4%) and SE (18.5%) challenging SSE (23.8%) and S (23.7%). About 38% of all swells are 1.5m (5ft) or bigger, so the power is real. The weakness is wind: ideal surfing wind drops to 43%, the lowest since the summer. ENE (18.6%) and E (19.0%) winds dominate the wind rose, and offshore N/NNW flow is scarce. Water temp is 20.7°C, air averages 21.7°C, rainfall 2.90 mm/day. A good S/SSW groundswell can still deliver, but you'll have to pick your windows carefully.
Average Spot conditions at Leblon in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Leblon 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 Leblon for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Leblon 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 Leblon.