Conditions at Kastro Point in May
May: The Flat Season Begins
May marks the official entrance to Kastro Point's low season. The average swell height collapses to 0.4m (1.3ft) and the average period falls below 5s to 4.6s, producing classic summer mush. The south quadrant drops to only 20% of the swell distribution, and even those waves are mostly in the sub-1m range. The dominant swell directions are now WNW (25.3%) and WSW (17.3%), both of which do almost nothing here. The meltemi/etesian winds begin to establish, giving some NW/WNW winds in the mix, but the lack of swell renders them irrelevant. Ideal surf conditions occur just 14% of the time. Air temperatures average 17.3°C, water warms to 19.2°C, and rainfall dries up to 1.33 mm/day. You can still squeeze out a longboard session if a late-season low drifts through, but May is more about beach days than barrels.
Average Spot conditions at Kastro Point in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Kastro Point 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 Kastro Point for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Kastro Point 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 Kastro Point.