Conditions at Cap Sim in September
September: First Signs of Renewed Life
September is when Cap Sim starts to shake the summer doldrums. The average wave height remains at 5.2ft (1.6m), but the period jumps to 10.1 seconds, a clear signal that longer-period energy is returning from more distant Atlantic lows. The NNW direction is still dominant at 72 percent, but NW climbs back to 16 percent and a few W/SW signals begin to appear in the mix. Ideal wind conditions improve dramatically to 45 percent, with NNE at 36 percent and NE at 27 percent, and the trade winds are noticeably less violent than in July and August. This makes for cleaner surfaces and better shaped waves even if the size is still modest.
September offers the warmest water of the year at 19.4°C, with air temps averaging 21.6°C and low rainfall. It is the best summer month to stay hopeful; as the season progresses, the surf will only get bigger.
Average Spot conditions at Cap Sim in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cap Sim during September. 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 September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cap Sim for September. 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.