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Conditions at Porthleven in July
July: Mid-Summer Lull
July is the heart of the summer lull. Average swell height remains around 4ft (1.2m), and the average period drops to 8.2s, the lowest of the year. The wave rose becomes extremely W-heavy: W (37.7%), WSW (20.8%), WNW (16.4%) and SW (8.4%). Most of these waves are short-period windswell, often soft and unorganised unless a rare low-pressure system sends a longer-period pulse north.
Wind data show a persistent run of W (12.9%), WNW (12.9%), WSW (11.9%), NW (10.0%) and NNW (10.4%) winds. The N/NNE/NE/ENE offshore quadrant accounts for only about 9.5% of the time, though ideal wind is still 21%, mostly in light morning pockets. Afternoon sea breezes frequently add cross-onshore chop to already small waves.
Water temperature reaches 16.1°C, air averages 16.3°C, and rainfall is 2.22 mm/day. July is the low point of the calendar. If you are surfing Porthleven now, it is for the love of the ocean and the clean small-wave moments, not for heavy Atlantic power.
Average Spot conditions at Porthleven in July
Swell history for July
Wind history for July
Swell quality
Analyze the groundswell consistency at Porthleven during July. 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 July.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Porthleven for July. 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.