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Conditions at Santa Rosa in September
September: The Last Big-Push Month
September closes the peak winter swell season with the average still sitting at 1.9m (6.2ft) and the period at 12.9s. The southerly flavor is at its strongest - S-sourced swell peaks near 19% of the distribution, while SSW contributes roughly 73%. This is an energetic, often raw combination for a WSW-facing beach. The wind regime, however, has not changed: S/SSW flow dominates and the ideal offshore wind percentage stays at 0%. Water temperature bottoms out at 15.2C, tied for the coldest of the year, and air temps average 16.8C. It's a month where stamina and local knowledge pay off; the swell is there, but you'll have to hunt for a wind-free window amid the blown-out chaos.
Average Spot conditions at Santa Rosa in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Santa Rosa 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 Santa Rosa for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Santa Rosa 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 Santa Rosa.