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Conditions at Dee Why Point in September
September: The Spring Mix
September is the classic shoulder month: winter leftovers collide with the first hints of spring and summer swell. The average height holds at 5ft (1.6m) and the average period sits at 9.0s. SSE and S swells still supply the bulk of the energy, but the optimum NE, ENE, E and ESE window accounts for about 34% of the total swell, offering more variety than June or July. The ideal wind percentage remains respectable at 36%, although afternoon sea breezes start to become more of a factor as the days grow longer.
Water temperatures bottom out around 18.4°C and air temperatures rise to 16.3°C, with rainfall only 1.68 mm/day. Early morning sessions are the safest bet for clean, rippable surf before the breeze switches.
Average Spot conditions at Dee Why Point in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Dee Why Point 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 Dee Why Point for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Dee Why Point 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 Dee Why Point.