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Conditions at Flagler Beach in September
September: Transition and Tropical Power
September is the moodiest month at Flagler Beach, with the highest average period of the year at 8.9s and an average size of 0.7m (2.3ft). The swell direction shifts dramatically back into the productive quadrant: ENE leads at 31.2%, E is right behind at 35.4%, NE contributes 11.3%, and ESE drops to 16.7%. The wind is still tricky - NE (12.2%), ENE (14.9%), E (11.6%), and NNE (7.6%) are all onshore or cross-onshore - so ideal wind days sit at just 13%. But September is peak hurricane season, and when the Atlantic basin lights up with a strong Cape Verde or Bahamas storm, Flagler can see legitimate 5-8ft (1.5-2.4m), 12-15s ENE groundswell. Air temperatures start to moderate (26.3°C/79°F), water temp reaches its annual max of 28.3°C (83°F), and rainfall remains high. This is the classic month for a hurricane swell with light offshore west winds - if it all lines up.
Average Spot conditions at Flagler Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Flagler 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 Flagler Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Flagler 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 Flagler Beach.