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Conditions at San Blas in December
December: Clean, Glassy and Small
December closes the year with the most favorable wind statistics of all: ideal surf wind at 66%, the highest of the year. The offshore quadrant (N/NNE/NE/ENE) supplies 50.3% of the wind, and NNE alone accounts for 32.2%, mostly at 10-20kph. The surface is often glassy and offshore, with groomed lines reeling down San Blas' sandbars. The catch is size: average swell drops to 3ft (1.0m), and the period eases to 12.2s.
Swell direction is still favorable, with SSW at 63.4%, S at 22.7% and SW at 5.5% - a 92.6% total from the optimal window. Height distribution is back-loaded into the 2-3ft (0.5-1m) category, but 28.6% of SSW waves still reach 3-5ft (1-1.5m). Rain is minimal at 0.30mm/day, air temps average 26.1°C and water stays warm at 28.4°C. December is the perfect month for a longboard, a step-down twin fin, or anyone who values clean, effortless waves over raw power.
Average Spot conditions at San Blas in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at San Blas 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 San Blas for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Blas 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 San Blas.