- Home
- ...South America
Brazil- Itacoatiara
Conditions at Itacoatiara in September
September: Big Swells, Fickle Wind
September is the deceptive shoulder month. The average swell height is still 5ft (1.5m) and the period remains 10.5s, so the ocean has plenty of energy. The S and SSE swell window is solid: SSE at 23.8%, S at 23.7%, SE at 18.5%, and ESE at 18.4%. SSW drops to 5.9%, so the perfect south-southwest arrow is less common. The main issue is wind: ideal conditions fall to 49%, the lowest of the year. ENE trade flow is huge at 25.2%, E adds 19.5%, and ESE shows 7.3%, but SW and WSW now mix in about 14%, so many days have a bumpy, wind-blown texture. The size is there, with meaningful 5-8ft (1.5-2.4m) sets from S, but you need a north/northeast wind window to get the best of the long-period groundswell. Water at 20.5°C is the coolest of the year, and rain begins creeping back at 2.90 mm/day.
Average Spot conditions at Itacoatiara in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Itacoatiara 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 Itacoatiara for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Itacoatiara 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 Itacoatiara.