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Conditions at Porthleven in September
September: The Autumn Hinge
September is the bridge between the summer doldrums and the autumn groundswell season. Average swell height picks up to around 4-5ft (1.4m), with a period average of 9.5s, and the wave energy starts to feel more meaningful. The swell rose is led by W (28.4%), WSW (17.5%), WNW (14.7%) and SW (8.2%), with a growing amount of swell coming from the S/SSW quadrant as early tropical-origin lows brush the region.
The wind regime is also transitioning. Ideal wind is 23%, one of the higher monthly values of the year. W (9.8%), WSW (9.7%), NNW (9.3%), WNW (8.7%), SW (8.2%) and SE (3.7%) make up a mixed picture, but N/NNE/NE/ENE offshore flow totals around 14.4%. The combination of warm water and new groundswell makes September one of the most rewarding months for quality-to-size ratio.
Water temperature is a comfortable 16.0°C, air averages 15.6°C, and rainfall is 2.33 mm/day. This is the month when Porthleven starts to wake up, and the surf community knows it.
Average Spot conditions at Porthleven in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Porthleven 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 Porthleven for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Porthleven 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 Porthleven.