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Conditions at Hermanus in December
December: Summer Slop With Occasional Gems
December at Hermanus is the low point for consistent quality. The South Atlantic high is well-established, producing a relentless ESE/E/SE trade flow-E 13.3%, ESE 17.6%, SE 12.6%, SSE 8.3%-and ideal wind drops to just 14%. Average swell is still 2.2m (7.2ft) but with a shorter, less powerful 11.1s period, and the direction mix is dominated by SW (30.4%) and SSW (16.8%) rather than the clean S/SSE/SE angles. The water warms to 18.8°C, air temps climb to 19.6°C, and daily rainfall is only 1.06 mm. When a strong S/SSE groundswell lines up with an early-morning NW offshore wind, Hermanus can still dish out fun, rippable waves-but expect plenty of average, choppy days in between. Bring your log and pick the dawn windows.
Average Spot conditions at Hermanus in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Hermanus 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 Hermanus for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hermanus 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 Hermanus.