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Conditions at Waikiki Beach in September
September: A Quiet Reset Before the North Pacific Returns
September is the tail end of the trade-wind season and the calm before the winter swell train. Average swell height dips to 4.5ft (1.4m), the lowest of the year, while the period climbs back up slightly to 11.4 seconds. The directional spread is still dominated by E at 31.1%, ESE at 20.8%, SE at 12.4%, and ENE at 12.0%, but there are small hints of N and NNW swell beginning to appear, including N at 0.3%, NNW at 1.4%, and NW at 0.7%. The surf is mostly 3.3-5ft (1-1.5m) trade swell, with less 6.5ft+ energy compared to mid-summer.
Wind remains trade-heavy, with ENE at 74.0% and E/NE contributing another 18.3%. The ideal offshore window is only 10%, so clean days are scarce. Still, average water temperatures peak at 27.0°C, and air temperatures remain warm at 26.2°C, with rainfall 1.34mm/day. As the month wears on, the first North Pacific lows start to spin up, and the chance of a better swell window begins to increase.
Average Spot conditions at Waikiki Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Waikiki 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 Waikiki Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Waikiki 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 Waikiki Beach.