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Conditions at Hanalei Bay in September
September: First Hints of North Swell
September is the classic waiting-room month. Average height is still 5-6ft (1.5-1.8m), but period has stretched to 9.3s and the direction mix is more interesting: ENE 43.7%, NE 19.8%, NNE 10.4%, E 10.9%, NNW 7.7% and N 4.8%. The first long-period north swells of the season start showing up later in the month, mixed with fading trade windswell.
The big story is wind. Ideal conditions occur 54% of the time, the best of any month, thanks to lighter, more variable winds and more frequent offshore southeast flow. When a September north-northwest groundswell lines up with a clean south wind, Hanalei can deliver sneaky-good, warm-water surf. Water temp is 26.8°C (80°F) and rain is still light, so this is a prime month for dialed-in surfers.
Average Spot conditions at Hanalei Bay in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Hanalei Bay 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 Hanalei Bay for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hanalei Bay 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 Hanalei Bay.