Conditions at Katahama in April
April: Swell Direction Improves, Wind Gets Fickle
April brings the first real taste of spring/summer swell, with the optimal directional window widening significantly. ESE (18.9%), SE (14.0%), SSE (9.8%), and E (9.4%) combine for over half of all swell - about 52.1%. The average period extends to 7.8s, making waves more organized and powerful. However, the wind story becomes more complicated. While W winds still blow 16.4% of the time, ENE (12.2%), WSW (11.9%), and E (10.1%) winds are also prominent, meaning onshore and cross-shore breezes are just as likely as offshore flow. The ideal wind score drops to 29%, and many of those E/ESE swells will be accompanied by easterly onshore winds that chop up the surface. The best sessions occur in the wake of passing fronts, when NW-to-W flow cleans up the sea before the next onshore pulse. Water temp rises to 16.5°C, air averages 15.7°C, and rain is common at 6.21 mm/day.
Average Spot conditions at Katahama in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Katahama 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 Katahama for your next trip in April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Katahama 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 Katahama.