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Conditions at Topanga Beach in September
September: Autumn Swell Returns
September is the first hint of autumn at Topanga. The average swell height is still modest at 0.8m (2.6ft), but the average period lengthens to 12.6s and the swell mix is SW 35.9%, WSW 38.8%, SSW 13.0%, and W 11.1%. The wind pattern begins to shift: while WSW (17.9%) and SW (12.8%) still dominate, there is a noticeable return of NW (5.6%) and NNW (6.1%) offshore flow, pushing ideal wind to 37%.
That is a significant improvement over midsummer. Water temp is at its warmest, 17.4°C, air temps 21.9°C, and rain remains scarce. Look for the first clean long-period SW swells of the season, especially on mornings with a fresh north wind.
Average Spot conditions at Topanga Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Topanga 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 Topanga Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Topanga 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 Topanga Beach.