Conditions at Raglan in September
September: Spring Groundswell vs. Spring Westerlies
September is a month of real contrast. The ocean is still in winter mode: average swell 2.2m (7ft) and the longest period of the year at 12.6s. WSW dominates at 34.0%, with SW at 12.8% and W at 11.2% making up most of the rest. The problem is the wind. Ideal offshore wind frequency plunges to 18%, the second-lowest of any month, as spring storm tracks push more W, WNW and NW fronts across New Zealand. This means lots of southwest groundswell gets chopped up by onshore westerlies. Still, the period and size are so serious that when a high-pressure ridge delivers offshore SSW/SW flow, the points turn elite. Water is still cold at 13.9°C and air averages 11.6°C - a damp, wild, occasionally extraordinary month.
Average Spot conditions at Raglan in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Raglan 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 Raglan for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Raglan 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 Raglan.