Conditions at Caldera in September
September: The Wettest Window, Long Swell Periods
September is one of the wettest months in Caldera, with precipitation climbing to 7.37mm/day, and the surf situation follows the same frustrating pattern. The average period remains strong at 14.2s, and SSW is 74.8% of the directional spectrum, with SW at 11.8%. But the average swell height stays around 1ft (0.3m), and only about 0.6% of the distribution reaches the 2-3ft (0.5-1m) category. The wind is largely onshore-southerly: SSE (12.5%), S (14.6%) and SSW (12.2%) are the top three wind sources, so clean surface texture is hard to find. Offshore flow from NNE/NE/ENE/E drops to around 21%. Air temperatures average 26.2°C, water temperature is 29.2°C, and the long-period micro-swell still lacks the size to produce meaningful waves. You will need a high-volume board and plenty of patience.
Average Spot conditions at Caldera in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Caldera 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 Caldera for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Caldera 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 Caldera.