Conditions at Costa Navarino in September
September: First Whiff of Autumn
September is the hinge month between summer flatness and winter potential, but it is still more summer than winter at Costa Navarino. The average swell height remains at 1.5ft (0.5m), period has crept up only slightly to 4.7s, and ideal offshore wind sits at 12%. NW and WNW still hold the top of the swell rose with 33.5% and 24.6%, but the W and WSW quadrants begin to add a bit more consistency, totaling 15.8% and 8.1% respectively. Some early autumn lows can inject a pulse of longer-period W/SW swell, but those events are the exception rather than the rule.
The wind regime starts to shift away from the pure summer meltemi, and mornings become a little more likely to offer clean, glassy conditions. Sea temperature is still very warm at 25.5°C, air temperatures average 23.5°C, and rainfall begins to tick up at 1.58 mm/day. If you see a low-pressure system approaching the Ionian in late September, it may be worth a surf check - otherwise, keep expectations low.
Average Spot conditions at Costa Navarino in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Costa Navarino 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 Costa Navarino for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Costa Navarino 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 Costa Navarino.