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Conditions at Cardoso in September
September: Big Swells, Shifting Windows
September posts the largest average swell height of the year at 2.0m (6.5ft), but looks can be deceiving. The lion's share of that energy is E/ENE/ESE trade swell - over 40% of the spectrum - while the S/SSW/SW window drops to 13%. Average period shortens to 9.2s, so the surf is punchy but often sectiony and cross-shore. Ideal offshore wind is only 21%, the lowest of the year, as the NE flow strengthens and becomes more variable. Still, the South Atlantic's spring transition can fire off late-season cold fronts, and when S/SSW groundswell coincides with a N/NE offshore breeze, Cardoso can still see excellent waves. Water temp is 18.0°C, air 18.2°C, and rainfall increases to 4.43mm/day. Choose your windows carefully.
Average Spot conditions at Cardoso in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cardoso 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 Cardoso for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cardoso 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 Cardoso.