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Conditions at Honolua Bay in September
September: First Hints of the North Pacific Storm Track
September is the starting line for fall. The average swell height is still modest at 1.3m (about 4ft), but the period lengthens to 9.8s and, crucially, the first N and NNW swells appear on the rose - N at 3.8% and NNW at 3.8%. ENE remains dominant at 48.0%, with NE at 19.6% and E at 14.0%, so most energy is still short-period trade swell. Yet the trend is clearly toward more north in the spectrum.
The wind data improve as well. Ideal wind reaches 30%, tied for the best of the year, and the trade wind share drops slightly to 65% ENE. Early autumn cold fronts can deliver clean 3-5ft (1-1.5m) NW pulses with southwest winds, and the water is still warm at 26.7°C. Air temperature averages 26.4°C, precipitation is 1.28 mm/day. For surfers, September is about watching the long-range charts for the first real west/northwest swell of the season.
Average Spot conditions at Honolua Bay in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Honolua Bay 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 Honolua Bay for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Honolua Bay 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 Honolua Bay.