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Conditions at Kealia Beach in May
May: Summer Grovel Season Begins
May is the start of the long Hawaiian summer lull. Average wave height falls to 6ft (1.8m), period to 10.2s, and the dominant energy now comes from the E at 31.3%, with ENE adding 25.7% and ESE another 9.0%. This is classic trade wind swell: short, punchy, and locally generated over open ocean, with less of the long-period groundswell that defined winter. The result at Kealia is a lot of waist-to-head-high lines, often sectiony and hard to connect.
Ideal offshore wind plummets to 6%, while ENE/E winds combine for over 66% of observations. There are occasional dawn windows when the trades ease or a light westerly develops, but consistently clean surf is rare. With water at 24.9°C, air at 24.1°C and rainfall low at 1.60mm/day, the weather is idyllic even when the surf is not. This is a board-shortening month, so bring a groveler if you are chasing peaks.
Average Spot conditions at Kealia Beach in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Kealia Beach 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 Kealia Beach for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Kealia Beach 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 Kealia Beach.