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Conditions at Grumari in December
December: Summer's Small but Punchy Start
December brings official summer and the smallest average wave height of the late-year cycle at 3.3ft (1.0m), with period down to 9.7s. The direction distribution is still all about the SSE-S axis: SSE 32.2%, S 30.1%, SE 19.8% and ESE 12.0%. That means Grumari's sandbars will see waves, but most are in the 2-3ft (0.5-1m) range, with a decent chunk of 3-5ft (1-1.5m) surf from S and SSE and only occasional 5-6.5ft (1.5-2m) sets. The trades are back in force, with NE 10.3%, ENE 11.7%, E 11.3% and ESE 9.5%, and the ideal wind window is only 40%, so you have to pick off the dawn sessions to find clean 3-5ft (1-1.5m) surf. With the highest rainfall of the year at 6.98 mm/day, air temperatures near 24.8°C and water temperature warming to 21.7°C, it is a holiday-vibe surf scene rather than a heavy-water one.
Average Spot conditions at Grumari in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Grumari 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 Grumari for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Grumari 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 Grumari.