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Conditions at Green Island in May
May: The Southern Ocean Wakes Up
May is when the Southern Ocean switches on and Green Island starts to fire. Average swell remains 1.7m (5.5ft), but period improves to 9.3s, and ideal wind percentage leaps to 51 percent. The offshore wind distribution is now dominated by WNW at 15.8 percent, followed by NW and NNW, giving the southeast-facing beach clean morning glass and light offshore texture through the day. Swell direction is excellent: S and SSE combine for over 33 percent of the total, with SE adding another 13.7 percent. Water temperature cools to 19.9°C, air to 16.8°C, and rainfall lowers to 2.37 mm/day. The better swells now have genuine push and longer intervals - surf in the 4-6ft (1.2-1.8m) range becomes common.
Average Spot conditions at Green Island in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Green Island 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 Green Island for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Green Island 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 Green Island.