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Conditions at Hanalei Bay in December
December: Prime Hanalei Season
December sits at the heart of Hanalei's prime season. Average swell height is a solid 8-9ft (2.4-2.7m) with 12.5s period. The direction table is led by NNW at 16.0%, with NNE at 8.2%, NW at 5.1% and N at 4.9%. Many of these are long-period, high-energy groundswells from strong North Pacific lows, producing the powerful, organized waves the bay is known for.
Offshore south and southeast winds are the golden ticket, showing up around 36% of the time. The trade-wind machine still runs, and onshore north flow is a factor when fronts stall, but the winter swell windows are consistent enough that patient surfers will score. Water temperature sits at 24.8°C (76.6°F) and air at 23.7°C (75°F), so it is still warm; just respect the size, mind the river after heavy rain, and chase the tides.
Average Spot conditions at Hanalei Bay in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Hanalei Bay during December. 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 December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hanalei Bay for December. 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.