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Conditions at Kalapaki Beach in September
September: The Wind Window of the Year
September serves up the most favorable wind statistics of the entire year, with 47% ideal surf conditions. The trades ease slightly (ENE at 57.4%, E at 21.0%), and the open-ocean swell average is 5.6ft (1.7m) on 9.9s periods. The waverose still shows E (36.3%) and ENE (32.5%) dominance, but the SE/SSE/S window holds at 2.4%, delivering a mix of 3-5ft (1-1.5m) and 5-6.6ft (1.5-2m) southeast swell into Kalapaki.
As the North Pacific begins to stir, NNW energy reappears at 2.5%, but it remains shadowed by the island. The combination of warm 26.7°C water, 26.1°C air (23.6-29.4°C), low rainfall (1.42 mm/day), and the best wind/swell alignment of the year makes September a standout month. Conditions are clean, playful, and very user-friendly.
Average Spot conditions at Kalapaki Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Kalapaki Beach 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 Kalapaki Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Kalapaki Beach 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 Kalapaki Beach.