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Conditions at Jacksonville Beach in September
September: The Season Stirs
September is where the seasonal tide turns. Average swell height jumps back to 0.6m (2ft) and the period is the highest of the year at 7.5s, a sign of both tropical energy and developing mid-latitude low pressure. Ideal wind is still limited at 6%, but the swell composition changes significantly: ENE (29.2%) and NE (11.3%) produce the strongest percentage of 1-1.5m (3-5ft) waves since spring, with isolated 1.5-2m (5-6.5ft) lines from NE/ENE. ESE (19.1%) and E (31.8%) still make up the bulk, but the northeast groundswell component is clearly waking up. Water temperature remains high at 28.2°C (83°F), air temperatures average 26.9°C (80°F), and rain averages 4.90mm/day. If a hurricane or major tropical storm is spinning off the Southeast coast, September can produce the best surf of the year.
Average Spot conditions at Jacksonville Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Jacksonville 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 Jacksonville Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Jacksonville 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 Jacksonville Beach.