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Conditions at Porthleven in August
August: Late-Summer Micro-Swell
August remains locked in the summer pattern. Average swell height is around 4ft (1.2m) with an average period of 8.4s. The swell rose is similar to July: W (36.5%), WSW (20.4%), WNW (15.5%) and SW (8.5%). True groundswell is rare, but the first hints of autumn can occasionally produce a slightly longer-period swell late in the month.
The wind pattern is also similar to July. W (11.8%), WSW (11.6%), WNW (11.6%), NNW (11.3%) and NW (9.3%) dominate the wind rose. Offshore N/NNE/NE/ENE flow is only about 9.4%, yet ideal wind registers 21%, mainly from light early-morning offshore breezes. By midday, the onshore wind usually takes over and degrades the small surf.
Water temperature is at its annual maximum: 16.8°C. Air averages 16.7°C and precipitation is 2.39 mm/day. August is still low season, but the water is pleasant and the occasional clean small-wave session justifies a summer trip.
Average Spot conditions at Porthleven in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Porthleven during August. 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 August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Porthleven for August. 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.