- Home
- ...Australia
Australia- Green Island
Conditions at Green Island in September
September: Spring Transition and Still Plenty of Punch
September is the spring transition, and Green Island can still deliver excellent days. Average height is 1.6m (5ft), period drops to 8.7s, and ideal wind remains respectable at 50 percent. Offshore flow from the N-WNW quadrant still totals 39.1 percent, with NNW contributing 12.0 percent and WNW 13.6 percent. The swell window is still generous - S (16.5 percent) and SSE (16.4 percent) are the dominant sources - but NE and ENE energy grows quickly, mixing in shorter-period swell. Water temperature starts to rise at 16.9°C, air averages 15.4°C and rainfall is the lowest of the year at 1.95 mm/day. It is a great month for those willing to pick the windows: clean winter-like days are still on tap, but the summer signal is creeping in.
Average Spot conditions at Green Island in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Green Island 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 Green Island for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Green Island 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 Green Island.