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Conditions at Hanalei Bay in August
August: The Calm Before the Return
August is a subtle turning point. Average height still sits at 5ft (1.5-1.6m) and period at 8.1s, and the direction mix remains firmly locked in the ENE/E trades, with 58.2% from ENE and 30.4% from E. The first hints of the North Pacific waking up are minimal in the numbers, but by late August the calendar starts to turn toward autumn.
The bigger improvement is wind: ideal conditions rise to 44%, the highest of the summer, because the trades are lighter and more variable mornings show up. This makes August the most surfable summer month at Hanalei, even if the swell is still small. Water temperature is warm at 26.5°C (80°F), and dry trade weather keeps the bay clear.
Average Spot conditions at Hanalei Bay in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Hanalei Bay during August. 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 Hanalei Bay for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hanalei Bay for August. 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 Hanalei Bay.