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Conditions at North Stradbroke Island in September
September: Spring Split Personality
September is a mixed bag, but when conditions align it can still be excellent. The average swell is 1.1m (3-4ft), but the period slips to 8.3s as spring winds start to add more windswell. East (16%), ESE (14%) and SE (15%) dominate, with a growing NNE/NE component in the mix. The wind rose now shows a near-even fight between NNW (18%) and SE/SSE (20% combined), giving ideal offshore flow 22% of the time. Rain is the lowest of the year at 1.46mm/day, air temps rise to 20.4°C, and water sits at 21.4°C. The best set-ups come when a passing front times a west-to-northwest offshore with a fresh SE/SSE swell - those days deliver glassy, lined-up surf before the day's building seabreeze arrives.
Average Spot conditions at North Stradbroke Island in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at North Stradbroke 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 North Stradbroke Island for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at North Stradbroke 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 North Stradbroke Island.