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Conditions at Mossel Bay in December
December: Summer Sun, Offshore Flow and Long-Period Fun
December rounds out the year with classic summer surf at Mossel Bay. Average swell is a dependable 6.6ft (2.0m) at 10.6s, and ideal winds are at 45 percent. SSW accounts for 28 percent of swell energy, SW adds 19 percent, and S adds 14 percent, so the bay is consistently fed by southern groundswell. The 5-8ft (1.5-2.5m) range dominates, giving rippable, high-performance waves rather than the oversized winter beasts.
Air temperatures average 20.8°C, water temperature is 20.3°C, and rainfall is light at 1.17mm/day. The E/ESE sea breeze is part of the daily rhythm, but the morning offshore windows are gold. December is the classic summer surf month: warm, consistent and forgiving.
Average Spot conditions at Mossel Bay in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Mossel Bay 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 Mossel Bay for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mossel Bay 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 Mossel Bay.