Conditions at Oniguchi in March
March: The Spring Shift Begins
March is a transition month. The average swell height eases to 1.2m (4ft), while the average period holds at 7.1s. NW swell still dominates, with NW at 18.5%, WNW at 11.7% and NNW at 9.3%, but the easterly swell window starts to expand: E reaches 9.5%, ESE 6.8% and ENE 7.5%. The ideal wind percentage drops to 49%, with NNW winds at 23.5% and NW at 18.8%. This is still a good month for clean surfaces, especially when an early spring low-pressure system tracks through the Sea of Japan and pulls the wind into the NO/ONO quadrant. Air temperatures warm to 14.9°C, water temperature sits at 18.5°C, and precipitation increases to 5.66 mm/day. Oniguchi remains rideable, but the quality becomes more inconsistent as the winter swell machine winds down.
Average Spot conditions at Oniguchi in March
Swell history for March
Wind history for March
Swell quality
Analyze the groundswell consistency at Oniguchi 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 Oniguchi for your next trip in March.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Oniguchi 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 Oniguchi.