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Conditions at Sao Conrado in September
September: Big Swell, Windier Battle
September matches the winter's biggest average swell heights at around 4-5ft (1.5m), but the average period eases to 10.5s and ideal winds drop to 42%, making it a more challenging month for clean conditions. SSE (24%) and S (24%) remain the main swell sources, with SE (18%) and ESE (18%) increasingly mixed in; there is still plenty of 5-8ft (1.5-2.5m) energy on the calendar. The problem is wind: E (19%) and ENE (19%) dominate, and the offshore N/NNW flow is less frequent as spring transition begins. Expect waves with more size but a less polished surface, especially on the east-leaning swell days. Air temperatures warm slightly to 21.7°C, precipitation picks up to 2.90mm/day, and water temp drops to 20.7°C. It is a month for patience, but the biggest S/SSE groundswell of the year can still deliver firing conditions when the wind aligns.
Average Spot conditions at Sao Conrado in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Sao Conrado 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 Sao Conrado for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sao Conrado 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 Sao Conrado.