Conditions at Shonan in April
April: South Swell Ramps Up as Winds Turn Fickle
April is a classic shoulder month at Shonan. The swell rose becomes a southern wall: SSE (20.0%), S (19.8%) and SSW (19.5%) combine with SE (15.0%) to make over 70% of all wave energy come from the preferred south quadrant. Average size is still a modest 2.6ft (0.8m) at 8.0s, but there are real 3-5ft (1-1.5m) SSW sets more than 5% of the time and the occasional 5-7ft (1.5-2m) pulse. The catch is wind. The transition to spring weakens the Siberian High, and warm south winds begin to dominate: SSW (15.7%) and SW (11.9%) plus S (8.9%) are increasingly onshore, leaving only 16% ideal offshore sessions. Air temperatures average 12.0C, water is 16.2C, and precipitation climbs to 4.26mm/day. On days when a clean N-NNE offshore is still in place, April offers fun, rippable south swell; otherwise expect soft, windblown conditions.
Average Spot conditions at Shonan in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Shonan during April. 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 April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Shonan for April. 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.