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Conditions at Long Beach in September
September: First Stirrings of Autumn
September is the first sign of autumn and the surf begins to stir again. The average swell height climbs back to 4.9ft (1.5m), and the period holds around 11.4s. W (43.0%), WSW (28.4%), SW (11.0%) and WNW (7.5%) combine for close to 90% of the wave directions, giving Long Beach a well-aimed if still modest swell window. Winds become more variable as early fall storms appear: WNW drops to 24.9%, NW to 11.4%, and offshore NE to ESE flow increases to 15.5%, pushing ideal conditions up to 28%. It is a shoulder month teetering between summer sea breeze and winter storm track. Water temps remain pleasant at 13.6°C, air temps average 13.5°C, and precipitation increases to 3.21mm/day. The occasional early-season frontal system can deliver a pulse of longer-period W-SW energy, and with lighter winds than July or August, September often offers the best quality-to-size ratio of the late summer.
Average Spot conditions at Long Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Long Beach 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 Long Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Long Beach 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 Long Beach.