Conditions at Manly in September
September: Spring Swing Begins
September is a telling transition month. Swell height is still 5ft (1.6m), but the average period drops slightly to 9.0s as the summer windswell regime begins to re-establish. The dominant swell directions remain SSE and S, with SE and ENE/NE energy also present. More importantly, ideal wind percentage jumps to 25% - a clear improvement over the midwinter grind. The wind rose still carries plenty of NNW and W flow, yet the return of NE and NNE winds is unmistakable; dawn offshore windows become more regular. Water temperature is still cool at 18°C, air temps rise to 16°C, and rainfall stays low. When a Tasman Sea high aligns with the first spring lows, Manly can produce clean, fun-size 3-5ft (1-1.5m) waves. It is hit-or-miss, but the misses are becoming less frequent.
Average Spot conditions at Manly in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Manly 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 Manly for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Manly 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 Manly.