Conditions at Waimea in September
September: First Whiff of Winter
September is the transition from summer doldrums to fall possibility. Average height remains small at 5.6ft (1.7m), but the period ticks back up to 9.2s, hinting at more organized energy. ENE still dominates the swell rose with 46.2%, NE adds 18.1%, and E contributes 13.9%, while the first meaningful NNW pulses appear at 5.5% - the leading edge of the North Pacific storm track. The 5-6.6ft (1.5-2m) class is well represented, and the XL category is nearly absent. Trade winds still rule, with ENE at 44.0% and E at 41.5%, but ideal offshore wind windows improve to 25%, often around dawn and dusk. Water temps are at their yearly max of 26.7°C, air temps average 26.2°C, and precipitation remains modest at 1.34mm/day. If you time a small NW pulse right, you can already get a taste of winter.
Average Spot conditions at Waimea in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Waimea 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 Waimea for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Waimea 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 Waimea.