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Conditions at Sun Beach in September
September: Waiting for the Season to Turn
September is the last truly flat month of the year. Average swell height remains at 1ft (0.3m), but the period ticks up slightly to 3.6 seconds. ENE still dominates the swell with 40%, while NE has strengthened to 25% - a sign that the trade wind field is starting to become more energetic. Yet the favourable N/NNW window still makes up only around 8% of the total and is nearly all below 0.5m.
Wind data shows E at 25%, ENE at 21% and ESE at 16%, so eastern cross-shore flow continues to plague the lineup. Offshore wind from the south/southwest is just under 8%. Water temperature holds at a warm 30°C (86°F), air at 29°C (84°F), and precipitation reaches its annual peak of 3.10 mm/day. Late September and early October can see the first cold fronts of the season begin to shift the wind and swell patterns, but statistically, Sun Beach is still locked in a summertime lull.
Average Spot conditions at Sun Beach in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Sun 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 Sun Beach for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sun 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 Sun Beach.