Conditions at Devil's Rock in September
September: The First Crack in Summer
September is when the North Atlantic starts to stir again, even if the size troll hasn't fully woken up. Average height falls to its lowest of the year at 4-5ft (1.5m), but the period climbs back to 10.1s, giving the swell more shape and push than the heart of summer. The swell rose is still 74.0% NNW, with NW adding 19.0%; true W/WNW swell is rare. Ideal wind edges up to 36%, and the water temperature is at its warmest, 18.4°C, with air temps still very pleasant at 25.2°C. Rain is minimal. This is a transitional month: the first cold fronts and offshore wind events can deliver surprisingly fun, glassy sessions.
Average Spot conditions at Devil's Rock in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Devil's Rock 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 Devil's Rock for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Devil's Rock 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 Devil's Rock.