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Conditions at Cronulla in September
September: Springtime Mix And More East Swell
September is a transition month, with the Southern Ocean still active but the tropics starting to exert influence. The average wave period drops slightly to 9.0 seconds, while average height sits at 5ft (1.6m). SSE and S swells remain the dominant energy source, but NE and ENE swells creep back to make the directional spread more varied. This can create excellent conditions when a fresh S/SSE groundswell coincides with the strengthening easterly trade flow.
Wind quality is still decent, with ideal offshore flow 34% of the time. NNW winds are common early in the month, while W and WSW winds still provide plenty of morning offshores. By the end of September, NE sea breezes become more persistent, limiting the clean afternoon window. Water temp is still cold at 17.9°C, air temp averages 16.3°C, and precipitation remains low at 1.68 mm/day. Surfers willing to wear booties can score some of the last great winter swells of the season.
Average Spot conditions at Cronulla in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cronulla 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 Cronulla for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cronulla 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 Cronulla.