Conditions at Cap Sim in May
May: Trade-Wind Season Takes Over
May is the true transition to summer. The average swell height drops to 5.6ft (1.7m) and the period to 9.4 seconds, so the surf becomes more punchy and less powerful. The wave rose is dominated by NNW swell at 62 percent, with a notable N component near 6 percent; pure W/SW swell is almost absent from the table. The northeast trade wind is now firmly in control - NNE at 35 percent and NE at 23 percent - and ideal surfing winds are down to 30 percent. These winds are directionally favourable, but they are often too strong, creating windblown and bumpy conditions across the beach.
May is dry and warmer, with average air temps of 18.7°C and water temperature reaching 18.4°C. It is a good month for small-wave high-performance boards and early-morning sessions before the trades build.
Average Spot conditions at Cap Sim in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Cap Sim 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 Cap Sim for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cap Sim 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 Cap Sim.