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Conditions at North Beach in September
September: Spring Signals and Southerly Swell
September is the first true spring transition. The average swell height remains 1.8m (6ft), but the period backs off to 9.6s and ideal wind drops to 36%. Southerly energy is prominent - S at 19.4% and SSE at 17.3% - while the favourable ENE/E/ESE window holds up well at 39.7%. The wind profile becomes more aggressive: SSW (15.9%) and NE (14.0%) are the two dominant directions, with S (10.2%) also strong. True offshore flow from SW/WSW/W/WNW only totals 16.0%, so clean sessions are more reliant on morning windows and passing cold-front clearouts. Water temp is 21.5°C, air temps are 20.4°C, and rain increases slightly to 1.86mm/day. The surf is still very rideable, but the magic of mid-winter is starting to fade.
Average Spot conditions at North Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at North Beach 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 North Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at North Beach 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 North Beach.