Conditions at Playa de San Juan in December
December: Peak Season at Playa de San Juan
December is the crown jewel of the surf year at Playa de San Juan. Average swell height sits at 1.6m (5ft) with an average period of 12.4s, and the swell direction spreads across a broad north-north-west to north-north-east window: NNW 24.7%, NNE 22.2%, NW 12.3% and N 12.1%. The 1.5-2m (5-6.5ft) range is particularly healthy, with occasional 2-2.5m (6-8ft) fire from the N and NNE.
More importantly, December registers the highest ideal wind percentage of the entire year at 12%. While NE (22.1%) and NNE (16.4%) winds still occur, the southerly offshore flow is frequent enough to give regular clean windows. Water temps cool to 19.8°C, air to 18.9°C, and precipitation is at its year-round high of 0.65mm/day. All the ingredients - long period, good height, favourable swell angle and a touch of offshore wind - line up for a proper winter surf month.
Average Spot conditions at Playa de San Juan in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Playa de San Juan 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 Playa de San Juan for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Playa de San Juan 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 Playa de San Juan.