Conditions at Pedra Branca in September
September: The Autumn Turn Begins
September is where the seasonal pendulum starts to swing back. Average wave heights climb to 5-6ft (1.5-1.8m), and the period jumps to 10.5s, marking the return of genuine swell organization to Pedra Branca. The dominant directions are still NW and NNW - 36% and 34% respectively - but the WNW percentage grows to 15.4%, and west swell makes a more consistent cameo. This is enough to create clean, pumping waves when conditions line up, especially during the first North Atlantic lows of the season.
Wind quality improves, though it is still far from winter consistency. Ideal surf wind frequency rises to 14%, with ENE/E/ESE/SE offshore flow reaching nearly 5%. NNE and NNW winds still dominate the background - NNW is at 36% - and summer nortadas can still ruin sessions. Air temperatures are mild at 19.8°C, water at 18.2°C, and rainfall increases slightly to 0.95mm/day. September is a sweet spot for lighter crowds and improving surf, especially when that late-summer ESE wind blows over a fresh NW groundswell.
Average Spot conditions at Pedra Branca in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Pedra Branca 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 Pedra Branca for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Pedra Branca 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 Pedra Branca.