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Conditions at Porth Neigwl in September
September: Autumn's First Swell
September is the quiet before the storm - literally. Average swell rises to 4-5ft (1.2-1.5m) and period ticks up to 9.5s, while the first strong Atlantic lows start to probe the UK coast. The waverose shows W at 28.4%, WSW at 17.5% and WNW at 14.7%, with an increasing amount of 1.5-2m energy compared with summer. Ideal wind is 21%, and the atmosphere is still warm enough to keep conditions pleasant. Water temp sits at 16.3°C and air at 15.6°C, with precipitation around 2.33mm/day. This is the time to start watching the extended forecast - the first solid groundswell of autumn can produce clean, powerful waves while the water is still warm enough for a 3/2 wetsuit.
Average Spot conditions at Porth Neigwl in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Porth Neigwl 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 Porth Neigwl for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Porth Neigwl 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 Porth Neigwl.