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Conditions at Snapper Rocks in September
September: The Spring Onshore Onslaught
September is where the quality window closes. The average period falls to 7.8s, ideal wind drops to 38%, and the wind rose shifts hard to the NNW (20.8%) and NNE (6.0%) quadrant - both onshore for this north-facing break. Average height holds at 3ft (0.9m), but the short period makes it chop up quickly under the prevailing flow.
Swell direction becomes more scattered, with NNE (12.7%) and NE (11.5%) contributing meaningful energy for the first time in months. In theory that is ideal swell direction for Snapper, but without offshore S/SW wind, it arrives as lumpy, closed-out mush. A strong southerly change can flip the script for a brief window, but September is mostly about patience. Water temp is 20.5°C, air is 12.0-26.7°C, and precipitation is low at 1.20mm/day.
Average Spot conditions at Snapper Rocks in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Snapper Rocks 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 Snapper Rocks for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Snapper Rocks 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 Snapper Rocks.