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Conditions at Cardiff Reef in September
September: The Ocean Stirs and First Hints of Autumn Cleanliness
September is a month of subtle change. Average swell height rises slightly to around 3ft (1m) while the average period stays at a long 13.6s. The swell mix is still summer-like, with SW (41.8%), WSW (34.0%) and SSW (16.0%) dominating, but more W (7.6%) energy begins to appear. Heights cluster in the 2-3ft (0.6-0.9m) range, with a decent share of 3-5ft (1-1.5m) peaks. It is not a big month, but there is often more consistency than August.
Wind quality starts to improve, though not by much. Ideal conditions climb to 6 percent, and northerly directions begin to creep back into the wind rose (NW 5.0%, NNW 2.4%). Still, W (34.0%), WNW (18.2%) and WSW (17.0%) keep daylight hours choppy. Near the end of the month, the first offshore pushes can line up the southwest groundswell beautifully. Water temperature is near its yearly maximum around 19.4°C.
Average Spot conditions at Cardiff Reef in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cardiff Reef 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 Cardiff Reef for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cardiff Reef 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 Cardiff Reef.