Conditions at Sines in August
August: Small, Clean Summer Fun
August is stuck in the same summer pattern as July, but with a few encouraging signs. Average swell height remains 4.3ft (1.3m), while average period edges up to 9.0 seconds. The deep-water swell is still almost exclusively NW, with NW at 68.6 percent and NNW/WNW making up most of the rest. The tiny amounts of WSW and W energy are enough to occasionally add a little shape, but S/SW groundswell is still rare. The big positive is wind: ideal offshore N/NNE/NE and NNW flow is highest of any month at 61 percent, marking August as the cleanest, most consistent summer wind month. If you pick a day with a pulse of NW swell, you can find fun, rippable 3-4ft waves.
Air temps peak on average at 23.0°C, rainfall is only 0.12 mm per day, and water temperature warms to 17.6°C.
Average Spot conditions at Sines in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Sines during August. 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 August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sines for August. 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.