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Conditions at Hanalei Bay in May
May: Summer Gears Up
May is the true shift into the low season at Hanalei. Average heights dip to 5-6ft (1.5-1.8m) and periods shrink to 9.3s. The directional spread is dominated by ENE (31.9%), NE (20.0%) and E (16.2%), while NNW has fallen to 7.7% and N to 4.9%. These east and northeast swells are driven by the trade-wind fetch and arrive at Hanalei as small, wrapping, short-period lines rather than the clean groundswells of winter.
Ideal winds actually occur 40% of the time in May, mainly through lighter morning windows, but the persistent trades from E and ENE still total about 66%. Expect classic summer Hanalei: fun little corners on an inconsistent 5-6ft (1.5-1.8m) day, with the occasional longboard gem. Water temperature climbs to 25°C (77°F), and rain is low, making this a beautiful month even when the surf is slow.
Average Spot conditions at Hanalei Bay in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Hanalei Bay during May. 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 May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hanalei Bay for May. 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.