Conditions at Inamuragasaki in April
April: Building South Swell Meets the Spring Onshore Gamble
April sees the south swell window open wide. SSE (20.0%), S (19.8%), SSW (19.5%) and SW (4.8%) combine for 64% of the total wave energy, and the average period holds at 8.0s with average height 0.8m (2.6ft). This means more consistent chest-high sets than the winter months, especially on S and SSW pulses that push waves into the 1-1.5m (3.3-4.9ft) range. The problem is the wind: onshore directions now account for about 41% of the time, with SSW (15.7%) and SW (11.9%) frequently in the 20-40kph zone, while offshore flow drops to around 37%. Ideal conditions occur only 16% of the time, often in early mornings before the seabreeze kicks in. Spring rains also pick up, averaging 4.26 mm/day, and air temperatures rise to 12.0°C; water temperature climbs slowly to 16.2°C. Patience is key - April can serve up genuinely fun, clean south swell, but you have to work for it between wind events.
Average Spot conditions at Inamuragasaki in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Inamuragasaki 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 Inamuragasaki for your next trip in April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Inamuragasaki 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 Inamuragasaki.