Conditions at Grupuk in April
April: Stronger Swell, Squeezed Windows
April is a true shoulder month. The average wave height rises back to 1.4m and period jumps to 13.8s as the Southern Ocean begins to stir. SSW swells dominate hard at 78%, with 10% from the S and 10% from the SW; the peak energy sits in the 1-1.5m and 1.5-2m bands, meaning there are some serious 5-6ft sets. But the ideal wind rate drops to 25%, as the ESE/SE trade winds start to control the weather. When the wind goes light early in the day, Grupuk can still deliver hollow, long-period surf; otherwise the persistent onshore wind shortens the session and chops the surface.
Average Spot conditions at Grupuk in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Grupuk 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 Grupuk for your next trip in April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Grupuk 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 Grupuk.