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Conditions at Oceanside Pier in September
September: The First Hint of Autumn Energy
September is a transitional month. Average swell rebounds slightly to around 3ft (1.0m) with a 13.6s period, and direction remains ideal: SW 42%, WSW 34%, SSW 16%, and W 8%. The mix is still largely driven by Southern Hemisphere and tropical-feed southwest groundswells, but the first, very early North Pacific low-pressure systems can send modest W/NW energy into the region. Most days sit in the 2-4ft (0.6-1.2m) range, with occasional 4-5ft (1.2-1.5m) sets from the SW/WSW.
Wind quality begins to improve slightly - ideal wind reaches 11% - but W and WSW onshore flow still dominate at 22.8% and 13.6%, respectively. The WNW component becomes more noticeable at 18.7% as the pressure gradient changes with fall. Water temperatures are still summer-warm at 18.8°C, air averages 21.3°C, and rain is minimal at 0.18mm/day. As October approaches, the offshore wind dial starts to turn and the surf becomes more organized.
Average Spot conditions at Oceanside Pier in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Oceanside Pier 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 Pier for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Oceanside Pier 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 Pier.