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Conditions at Hanalei Bay in April
April: Transition Season with Trade-Swell Undertones
April ushers in the transition from winter to summer. Average swell height drops to 6-7ft (1.8-2.1m) and periods shorten to 10.5s. The direction board is now led by ENE (23.3%), NE (18.4%) and NNE (12.5%), with NNW still holding at 10.9% and N at 5.6%. This means Hanalei sees a mix of fading winter groundswell and building trade-wind swell, often in the same week.
Winds are the bigger story: E and ENE trades combine for 67% of observations, leaving only 31% ideal conditions. The bay becomes more inconsistent, and surfing quality depends on catching a late-season NNW pulse with a morning offshore. Air temperatures sit near 23°C (73°F), water at 24°C (75°F), and rainfall drops to 1.6mm per day for cleaner water.
Average Spot conditions at Hanalei Bay in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Hanalei Bay during April. 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 April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hanalei Bay for April. 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.