Conditions at Sao Juliao in December
December: Peak-Season Big Wave Potential
December rounds out the year with some of the best surf Sao Juliao has to offer. Average swell height is 2.5m (8.2ft) and period is 12.7s, so the beach is firing on a regular basis. The swell direction is slightly more westerly than the heart of summer, with NW (21.2%), WNW (15.2%), NNW (11.3%), and W (6.1%) dominating; WSW (3.0%) also starts to contribute more, making the most of the beach's west-northwest exposure. Windwise, December is the best month along with January: the offshore ENE, E, ESE and SE sectors combine for a robust 25% of all observations, while strong NNW winds are less frequent (11.0%). That means more clean, hollow, powerful waves, especially when a low-pressure system passes north and drags an easterly wind over the coast. Water temp has cooled to 14.9°C, air averages 12.3°C, and precipitation is 2.69 mm/day. Winter is here, and it's beautiful.
Average Spot conditions at Sao Juliao in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sao Juliao 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 Sao Juliao for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sao Juliao 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 Sao Juliao.