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Conditions at Newport in September
September: Spring's Battle Between Offshore Mornings and Sea Breeze
September is a true mix of seasons. Ideal winds drop to 36% and the average period cools to 8.9s, but swell height holds around 4ft (1.3m). The dominant swell directions are SSE (21%), SE (14%) and S (14%), with ENE (11%), E (11%) and ESE (11%) becoming more significant. The westerly belt still produces W/NW offshore mornings, but afternoons become increasingly unstable as spring sea breezes develop. Water temperature starts to warm from the winter minimum, averaging 18.2°C, while air sits at 15.6°C and rainfall is 1.65 mm/day. September rewards sunrise sessions: score the Southern Ocean groundswell with a clean offshore wind, and Newport can be world-class for a few hours before spring weather takes over.
Average Spot conditions at Newport in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Newport 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 Newport for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Newport 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 Newport.