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Conditions at Oceanside Pier in December
December: Peak Offshore Wind and Consistent W Groundswell
December finishes the year strong. The average swell is around 3ft (1.0m) with a 12.6s period, but the true highlight is the wind. Ideal offshore wind is recorded 51% of the time, the second-highest of the year behind January. The directional mix is classic winter: W 55%, WSW 29%, and SW 11%, with W swell providing a healthy spread of 2-5ft (0.6-1.5m) waves plus 5-6.5ft (1.5-2m) sets on the biggest days.
NE and NNE winds combine for over 25% of observations, meaning the pier frequently sees clean, textbook offshore conditions. When winter storms are active, the southwest-facing beach becomes a funnel for powerful, long-period groundswell. Air temperatures average 14.8°C, water cools to 15.0°C, and precipitation increases to 1.71mm/day - a small price for the most consistent surf and best wind window of the year. December is the epitome of Oceanside's surf season.
Average Spot conditions at Oceanside Pier in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Oceanside Pier 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 Oceanside Pier for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Oceanside Pier 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 Oceanside Pier.