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Conditions at Mount Maunganui in September
September: Spring Transition and Short-Period Chop
September is a transition month with an identity crisis. The average period drops to 7.6s, the lowest of the year alongside October, which means a lot of short-period, wind-driven chop. Swell direction is still workable, with 44.5 percent from the optimal NNE-NE-ENE-E window, but the increasing W/NW energy, with W at 9.5 percent, WNW at 7.4 percent, and NW at 7.0 percent, reflects strengthening pre-spring westerlies. The wind picture is a double-edged sword: WSW at 18.8 percent and W at 16.6 percent deliver 44 percent ideal days, but these are often strong, and when they clock above 30kph they can hold the surf open and bumpy. Average height holds at 1.2m (4ft). Water temperature is bottoming out around 14.6°C with air at 12.8°C. For the flexible surfer, the clean windows between fronts are where the magic happens.
Average Spot conditions at Mount Maunganui in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Mount Maunganui 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 Mount Maunganui for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mount Maunganui 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 Mount Maunganui.