Conditions at Cova do Vapor in September
September: The Autumn Engine Fires Up
September is the turning point of the year. Average swell height is still a modest 1.1m (3.5-4ft), but period climbs back to 10.5s, signaling more organized swell on the way. The wave rose still leans heavily on NW (50.4%) and WNW (31.6%), but W (8.9%) and WSW (2.9%) begin to contribute more frequently. Ideal wind frequency jumps to 40%, with NNW (43.0%) and NW (11.6%) leading the offshore flow. The first autumn ex-hurricanes and strong mid-latitude lows can already send pulses of clean southwesterly/westerly swell. Water temps are warm at 18.4°C, air averages 19.9°C, and rain starts to increase to 0.89mm/day. September morning sessions are excellent for getting back into rhythm after the summer flatness.
Average Spot conditions at Cova do Vapor in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cova do Vapor 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 Cova do Vapor for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cova do Vapor 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 Cova do Vapor.