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Conditions at Oceanside in September
September: First Hints of Autumn in the Air
September is still a summer month, but the seasonal shift starts to show. Average swell height is 1.0m (3.3ft), and the period stays long at 13.6s. Swell directions are excellent: SW leads at 41.8%, WSW at 34.0%, and SSW at 16.0%. Most of the surf remains in the 2-5ft (0.5-1.5m) range, but the W direction begins to show a few larger pulses, a sign that the North Pacific storm track is waking up.
Wind quality improves slightly, with ideal offshore conditions at 11% of the time. W winds still dominate at 22.8%, but WNW at 18.7% and NW at 9.9% suggest more frequent morning offshore or cross-offshore pockets. Water temp is the warmest of the year at 18.8°C (65.8°F), and air temps reach 21.3°C (70.3°F). Later in the month, the first real autumn swells arrive, and the dawn patrol windows grow more reliable.
Average Spot conditions at Oceanside in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Oceanside 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 Oceanside for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Oceanside 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 Oceanside.