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Conditions at Sao Conrado in December
December: Summer Returns, Small and Clean Windows
December marks the official beginning of Rio's summer season, and Sao Conrado settles back into smaller, shorter-period surf. Average heights fall to around 3-4ft (1.1m), the average period is 9.7s, and ideal winds are 45%. Swell direction is still dominated by SSE (27%), S (25%) and SE (21%), with ESE contributing 15%, but almost all of the energy is in the 2-3ft (0.5-1m) and 3-5ft (1-1.5m) classes. The good news is that offshore N/NNW winds occur frequently enough in the mornings to keep the small peaks clean and rippable. With the summer rainy season underway, expect 7.05mm/day of precipitation, warm air temps near 24.7°C and water temp beginning to rebound at 21.9°C. It is not a month for chasing size; it is a month for groveling on a fun summer longboard or twin-fin when the ocean is glassy.
Average Spot conditions at Sao Conrado in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sao Conrado 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 Conrado for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sao Conrado 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 Conrado.