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Conditions at Margaret River in September
September: Winter Groundswell Meets Spring Transition
September is the crossover month. The ocean still has plenty of winter in it, with average swell height 2.6m (8.5ft) and period 13.2s. Swell directions are exactly where you want them: SW powers in with 28.4%, WSW adds 15.9%, and there's a notable W contribution. The wind, however, starts to transition back to the subtropical ridge pattern. E/ESE/SE winds become more common and the pure offshore component (NE/ENE/E/ESE) gets a bit more reliable, although at 18% ideal wind it's still an onshore-prone month on the whole. Passing fronts still swing the wind into the SW/W quadrant, so timing remains critical. Air temp creeps up to 14.4°C, water is at its coolest of the year at 17.5°C, and rainfall drops to 2.52 mm/day. This is a great month for experienced surfers hunting late-winter slabs before autumn cleanliness fully returns.
Average Spot conditions at Margaret River in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Margaret River 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 Margaret River for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Margaret River 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 Margaret River.