Conditions at Sines in October
October: The North Atlantic Roars Back to Life
October is a genuine turning point at Sines. Average swell height jumps to 5.9ft (1.8m), and average period climbs to 11.4 seconds as the first strong extratropical cyclones of the season march across the North Atlantic. NW swell is still the most common at 39.1 percent, but the proportion of W, WSW and S/SW energy grows noticeably, and the longer-period pulses begin to wrap into the south-facing beach with real push. This is the start of the high-quality window: when an S/SW swell coincides with an offshore N/NNE/NE or NNW wind, Sines transforms into a proper, firing Atlantic wave. Ideal wind occurs 54 percent of the time, so conditions are still a bit mixed, but the increasing swell size makes the risk worth it.
Air temperatures cool to 18.5°C, rainfall increases to 2.22 mm per day, and water temperatures sit at 18.3°C, the warmest they will be during the prime season. A 4/3 wetsuit works well.
Average Spot conditions at Sines in October
Swell history for October
Wind history for October
Swell quality
Analyze the groundswell consistency at Sines during October. 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 Sines for your next trip in October.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sines for October. 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 Sines.