- Home
- ...North America
Costa Rica- Esterillos
Conditions at Esterillos in September
September: Big South Pulse and the Return of Westerly Flow
September marks the final peak of the rainy season and another strong month for SSW/SW groundswell. Average height remains at 4.5-5ft (1.4m), while the period eases to 13.0s. The SSW direction accounts for 84.0% of the swell, but the SW share rises to 14.6%, bringing a more open angle to the beach. Almost 23% of the SSW energy is in the 5-6.5ft (1.5-2m) category, and the SW component adds another 4.4% at that size, so thump and power are the name of the game.
The wind regime becomes slightly more promising. While SSE/SE and SW winds still dominate, the WNW direction jumps to 11.4% and NW to 8.8%, giving more frequent offshore or cross-offshore clean windows. Ideal surf wind improves to 34%. With rain still falling at 8.68mm/day, these WNW windows are precious but they're increasingly common as the ITCZ weakens. Air temps average 25.5°C, and water temp drops slightly to 28.7°C.
Average Spot conditions at Esterillos in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Esterillos 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 Esterillos for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Esterillos 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 Esterillos.