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Conditions at Waikiki Beach in December
December: Peak Season Momentum
December delivers the first full month of peak-season surf. Average swell height reaches 6ft (1.8m) with a robust average period of 12.1 seconds. The swell direction is a strong mix of North Pacific groundswell and trade wind swell. NNW leads with 14.0%, NW follows with 12.7%, WNW adds 6.0%, and N/NNE combine for another 10.3%. ENE also contributes 18.1% and NE 9.4%, so the ocean is often a mix of long-period NW groundswell and shorter-period trade swell. Most of the energy sits in the 3.3-8ft (1-2.5m) range, with some solid 6.5-8ft (2-2.5m) pulses from the ENE and NW sectors.
The wind pattern offers more chances. ENE is still the most common direction at 41.3%, but the S/SSW/SW offshore flow appears 19% of the time, one of the best windows of the year. This is the month when the stars align: a deepening Aleutian Low sends NW groundswell toward this stretch and a southerly Kona wind or light trade-wind morning cleans it up. Air temperatures are 23.6°C, water 25.0°C, and rainfall averages 2.29mm/day.
Average Spot conditions at Waikiki Beach in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Waikiki Beach 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 Waikiki Beach for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Waikiki Beach 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 Waikiki Beach.