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Conditions at Kealia Beach in September
September: The First Stir of Autumn
September is still summer-like, but the first stirrings of the North Pacific can be seen. Average height remains around 5-6ft (1.5-1.8m), while average period nudges back to 9.9s. The east dominates as always - E 36.3%, ENE 32.5%, NE 10.6% - yet there are small hints of N and NNW groundswell sneaking in. The surf is a little less zippy than July or August, with slightly more intention in the longer-period pulses.
Still, the wind picture remains brutal for quality: ideal offshore flow only 2% of the time, while ENE winds blow 57.4% and E winds 21.0%. Kealia stays in onshore trade chop for the vast majority of the month. With air at 26.1°C and water at 26.7°C, the warmest of the year, and rainfall at 1.42mm/day, it feels more like a beach day than a surf session. But the ocean is starting to wake up.
Average Spot conditions at Kealia Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Kealia Beach 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 Kealia Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Kealia Beach 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 Kealia Beach.