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Conditions at Hermanus in September
September: Shoulder Season Transition
September is a true shoulder month: the ocean is still full of winter energy-average 2.6m (8.5ft) and 11.9s periods-but the clean wind percentage drops to 24%. The wind rose shows E (13.5%), ESE (10.0%) and SE (5.6%) trades regaining ground, while WNW (14.9%) and NW (11.9%) still deliver offshore days, especially behind frontal passages. Swell direction is more balanced, with SW (18.1%), WSW (9.6%), SSW (10.8%), S (5.9%) and SSE (3.8%). The S/SSE/SE energy is a little more available than in mid-winter, and when combined with a light offshore wind, September can dish out excellent, glassy surf with fewer crowds. Water temps start to warm from 15.5°C and air temps rise to 14.3°C, making dawn sessions more comfortable.
Average Spot conditions at Hermanus in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Hermanus during September. 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 September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hermanus for September. 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.