Conditions at Ondarreta in March
March: Early Spring, Still Plenty of Bite
March keeps the window open. The average swell height eases to 1.8m (6ft) and the period still sits at a strong 12.1s. The NW source becomes even more dominant, at 37.5%, with WNW next at 26.5% and NNW at 10.7%. In other words, the ocean has not yet switched into summer mode, and clean, long-period groundswell is still available through the month.
The trade-off is the wind. The ideal offshore percentage drops to 41%; S and SSW winds still flow at 11.5% and 6.4% respectively, but WNW/NNW winds are on the rise, and afternoon sea breezes start to creep in on sunnier days. Average air temperatures are a milder 10.7°C, precipitation is lower at 2.62 mm/day, and water temps stay cold at 12.7°C. March rewards patience: pick the mornings with offshore south wind and you will still find solid, powerful waves before spring truly takes hold.
Average Spot conditions at Ondarreta in March
Swell history for March
Wind history for March
Swell quality
Analyze the groundswell consistency at Ondarreta during March. 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 March.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ondarreta for March. 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.