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Conditions at Ansteys in September
September: Spring Transition Tightens the Windows
September is a transitional month. The average wave height remains robust at 5-6ft (1.8m) and there is still powerful swell in the water, but the average period backs off to 9.6s and ideal wind drops to 28%. The swell direction is broad: S leads at 19.4%, SSE at 17.3%, SE at 14.5%, ENE at 13.7%, and E at 13.5%. Despite shorter average periods, the S direction still carries 6.4% of waves in the 6-8ft (2-2.5m) range, so the big stuff can still show up.
Winds become more erratic as spring warmth battles the remnants of winter. SSW flow jumps to 19.7%, while NE and NNE combine for 32.9%. True W/NW offshore windows become rarer, dropping the ideal percentage to 28%, but a classic September cold front can still deliver a few days of clean W/NW flow. Water temperature starts to rise at 21.5°C, air averages 20.4°C, and rainfall increases to 1.86mm/day. Stay flexible and pick the windows.
Average Spot conditions at Ansteys in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Ansteys 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 Ansteys for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ansteys 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 Ansteys.