Conditions at Florence in September
September: The First Autumn Swell Rumbles Back
September is where the surf season starts to turn back on. The average swell height climbs to 5.5ft (1.7m) and the period lengthens to 10.7s as the first autumn lows begin to form in the North Pacific. The swell direction shifts back toward WNW (31.2%) and NW (25.9%), with W (17.1%) also contributing. These are still moderate-sized waves, but the period is improving and the quality potential increases with each passing week. The first proper groundswell of autumn can arrive late in the month, often catching the tail of a still-summer-like coastline.
The wind also cooperates more often. Ideal conditions jump to 27%, the best since spring, as the strong summer NNW winds begin to break down. While NNW still dominates at 31.5%, the return of NE and N winds offers more offshore and cross-shore opportunities, especially in the mornings. Dry weather continues with 1.48 mm/day of rain, air temps remain pleasant at 14.7°C, and water temp is 12.0°C. September is an increasingly attractive month for chasing cleaner, more powerful surf before winter fully arrives.
Average Spot conditions at Florence in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Florence 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 Florence for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Florence 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 Florence.