Conditions at Big Rock in September
September: Late Monsoon Gold
September keeps the summer momentum going, with ideal offshore wind time still at 73% and the average period remaining solid at 9.1s. The average swell height backs off slightly to 0.9m (3ft), but 2-3ft (0.5-1m) and 3-5ft (1-1.5m) surf are still plentiful. SSE and S remain the dominant swell directions, though there is a touch more SE energy mixed in. The monsoon is starting to weaken, but southwest winds still blow consistently from SW, WSW and SSW, keeping the spot groomed. With water temp at 29.2°C and air at 28.3°C, conditions are warm but increasingly rainy - 4.41mm/day is the highest monthly average of the year. September offers a great late-season window before the wind regime flips back to the northeast in October.
Average Spot conditions at Big Rock in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Big Rock 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 Big Rock for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Big Rock 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 Big Rock.