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Conditions at Middleton in September
September: Winter Swell, Spring Light
September is the sweetest of crossover months. The ocean hasn't stopped delivering - the average swell remains 1.5m (4.9ft) at 12.4s - while the seasonal shift brings lighter winds and longer windows of sun-dappled, high-pressure calm. The swell direction favours SW (49.2%) over SSW (32.5%), with WSW (7.7%) still in the mix, keeping Middleton very much in the path of deep Southern Ocean storms rolling from the Bight. Set waves are reliably in the 1-1.5m (3.3-4.9ft) range (23.1% from SW) and the 1.5-2m (4.9-6.6ft) class (12.5% from SW, 11.4% from SSW).
The wind rose becomes more variable as spring systems cycle through: WNW (11.0%) and NNW (10.0%) still deliver offshore quality, while W (10.0%) and WSW (9.1%) introduce a more cross-shore component. Ideal conditions settle at 39%. Water temperature begins its slow recovery at 14.2°C, air reaches 13.0°C, and precipitation eases to 1.75 mm/day. It is the season of big swell and hopeful skies - a joy to be in the water at Middleton.
Average Spot conditions at Middleton in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Middleton 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 Middleton for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Middleton 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 Middleton.