Conditions at San Juan in January
January: The Trade-Wind Grind
The North Atlantic high stays strong in January, and the swell rose tells the story: 49% of all waves arrive from due E and another 39% from the ESE, with only a sliver of NE/ENE energy pushing in from more favorable angles. Most of that energy sits in the 2-3ft (0.5-1m) band, bumping the monthly average to 3ft (0.9m), but the 6.2s period means it is average-period trade-wind energy rather than groundswell. For a beach facing NNE, this is a glancing, cross-shore wave that is fun-sized at best and often lumpy.
Winds are dominated by the easterly trades too - E (37%), ENE (21%) and ESE (19%) - creating side-shore to slightly onshore texture much of the time. The good news is that ideal/offshore wind windows open up 22% of the time, usually when the high weakens and S to SW flow takes over. Those windows feel like a gift: air temps around 25°C, water a warm 26.6°C and waist-high lines with clean faces. It is not going to win any awards, but a log or a groveler will get wet.
Average Spot conditions at San Juan in January
Swell history for January
Wind history for January
Swell quality
Analyze the groundswell consistency at San Juan during January. 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 Juan for your next trip in January.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Juan for January. 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 Juan.