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Conditions at Hermanus in July
July: Big Winter Swell and Post-Frontal Gems
July is statistically similar to June-average swell 2.8m (9ft), period 12.5s, and 36% ideal wind-making it the peak of the season. The ocean is constantly being reshaped by low-pressure systems in the South Atlantic and the Roaring Forties, producing a mix of SW (20.2%), WSW (10.5%), SSW (7.9%) and S (2.8%) groundswell. The wind pattern remains favorable: NW (19.0%), WNW (13.9%), NNW (8.1%), with W (8.6%) assisting. In between frontal passages, the wind can swing from fresh NW offshore to variable light, giving clean conditions. The downside is winter chill: air temperatures bottom out at 12.9°C, water cools to 15.0°C, and rainfall peaks at 2.00 mm/day. But when the sky clears and a long-period S/SSE swell fills in, Hermanus offers some of the most powerful, hollow surf on the Cape coast.
Average Spot conditions at Hermanus in July
Swell history for July
Wind history for July
Swell quality
Analyze the groundswell consistency at Hermanus during July. 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 July.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hermanus for July. 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.