Conditions at Haleiwa in August
August: The Quietest Month
August is historically the smallest month of the year at Haleiwa. The average swell height bottoms out at 5ft (1.6m) and the period is a sluggish 8.0s. The wave-energy distribution is almost entirely from the trades: ENE at 57.2%, E at 33.5%, and NE at 5.7%. Directions that actually work at Haleiwa - N, WNW, NW, and NNW - total less than 1% of the recorded swell. There is simply not enough power or right-direction energy to create a proper North Shore wave.
Winds are still locked in the summer trades, with ENE at 70.7% and E at 18.6%. However, the percentage of ideal wind rises to 44%, which means the ocean can look glassy for short windows; it just lacks any swell. Air temperatures are at their warmest, averaging 26.1°C, while water temperature sits around 26.7°C. For Haleiwa this is a month to tune the longboard, work on fitness, or wait for the Pacific to stir awake.
Average Spot conditions at Haleiwa in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Haleiwa 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 Haleiwa for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Haleiwa 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 Haleiwa.