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Conditions at Cannon Beach in September
September: The First Swell Pulse of Autumn
September is a turning point at Cannon Beach. The average swell height climbs to 4-5ft (1.4m), the period stretches back to 10.6s, and the swell window is again dominated by WNW (47 percent) and W (33 percent). While still smaller than winter, these swells carry more energy and consistency, and the first true North Pacific storms of the season can deliver solid head-high-plus sets by late month.
Equally important, the wind regime begins to loosen its grip. NNW wind is still the most common at 27 percent, but offshore ENE/ESE/SE flow increases to around 5 percent, and the wind is ideal for surfing 25 percent of the time. That is a significant jump from summer and brings more dawn patrol glass-offs and clean windows between fronts. Sea surface temperature holds at 13.0°C, air temps average 14.0°C, and rainfall starts to pick back up to 2.26 mm/day. September is an excellent month for surfers looking to avoid winter crowds while still getting their first taste of the coming season.
Average Spot conditions at Cannon Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cannon Beach 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 Cannon Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cannon Beach 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 Cannon Beach.