Conditions at Grupuk in May
May: Big Indian Ocean Swell Meets SE Trades
May brings the first serious jump in swell size and period, with average heights reaching 1.6m and periods of 14.1s. Swell is split between SSW (60%) and S (29%), and a healthy portion sits in the 1.5-2m range, so south-facing breaks start seeing consistent 5-6ft sets. The glaring problem is wind: ideal conditions occur only 7% of the time. ESE and SE trades blow at 20-30kph for much of the month, turning the ocean into bumpy, windblown conditions. The rare pre-dawn lull can offer clean, powerful waves before the seabreeze ruins it. Water is still warm at 28.9°C.
Average Spot conditions at Grupuk in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Grupuk 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 Grupuk for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Grupuk 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 Grupuk.