Conditions at Ondarreta in August
August: Warm Water, Small Summer Lines
August remains in the summer surf cellar, though there is a faint pulse of energy compared with July. The average wave height is still 1.0m (3ft), and the average period is 9.2s, so waves are small but still punchy. The NW machine continues to dominate, with 64.9% of all swell from the NW, 16.4% from the NNW and 15.9% from the WNW. The bulk of the swell is again soft 0.5-1m (2-3ft) and 1-1.5m (3-5ft) surf, with a few 2m (6ft) waves on bigger pulses.
Winds continue to blow from the wrong side. Ideal conditions exist only 28% of the time; the wind distribution is led by NNW (17.9%), WNW (11.5%), NNE (11.4%) and NW (12.8%). These unfavourable breezes make quality difficult, especially in the afternoon. The good news: water temps peak at 22.6°C, air temps average 20.8°C, and rain is scarce at 1.73 mm/day. It is summer-rashguard surf, but true swell hounds are already looking at September.
Average Spot conditions at Ondarreta in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Ondarreta 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 Ondarreta for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ondarreta 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 Ondarreta.