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Conditions at St Ives in September
September: The Autumn Awakening
September is the hinge month when the North Atlantic starts to wake up. Average swell height climbs back to 1.4m (4-5ft), average period lengthens to 9.5s, and the ideal-wind percentage jumps to 22% - the best of any month on paper. W (28.4%) and WSW (17.5%) remain the workhorses, but WNW (14.7%) delivers more quality direction, and the distribution of 1.5-2.5m waves expands noticeably. This is the magic transition period: the ocean still has summer warmth, but autumn lows are beginning to spin up and send long-period pulses toward Cornwall. Wind patterns are more favorable too, with WSW (9.7%), SW (8.3%) and SSW (7.1%) offshore options outweighing the NNW (9.4%) onshore influence. Sea surface temperature is still a comfortable 16.3°C, air temps average 15.6°C, and precipitation ticks upward. For St Ives, September is the sleeper pick - cleaner than summer, and far less punishing than mid-winter.
Average Spot conditions at St Ives in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at St Ives 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 St Ives for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at St Ives 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 St Ives.