Conditions at Shonan in March
March: Equinox Swells and a Shift Toward True South
March is a turning point. The average swell height edges up to 2.6ft (0.8m) and the period to 8.1s, while the direction distribution finally swings in Shonan's favor: SSW (17.2%), S (14.9%) and SSE (12.2%) are now the dominant swell directions, with SE adding another 9.0%. This is exactly the south-quadrant exposure that the beach is built for. The bigger size classes show more life too, including 3-5ft (1-1.5m) SSW and S swells appearing 3.3% and 2.4% of the time, and occasional 5-7ft (1.5-2m) pulses. Offshore winds are still reliable -- NNE logs 23.3%, with NE and N crossing through -- and the ideal-wind percentage sits at 18%. Water temperature is 15.0C, air temperature averages 6.8C, and precipitation increases to 3.83mm/day as spring fronts become more active. If you pick the right day, March can deliver the season's best combination of south swell, clean surface and building power.
Average Spot conditions at Shonan in March
Swell history for March
Wind history for March
Swell quality
Analyze the groundswell consistency at Shonan 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 Shonan for your next trip in March.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Shonan 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 Shonan.