Conditions at Niijima in April
April: Shoulder Season with Real East-Swell Potential
April is one of the more underrated months for Niijima. The average height eases to 1.5m (5ft), but the period holds at 7.5s and the optimal NE-SE quadrant now accounts for 47.2% of the swell spectrum. E and ESE lead at 13.6% and 12.4%, SE and ENE add 9.5% and 9.8%, and even SW and WSW provide 9.8% and 7.9%. This is the first month where the east-facing beach is not constantly starved for direction; rather, it is starved for size.
Offshore wind frequency ticks up to 14%, with WSW the leading offshore breeze at 12.7%, followed by W at 10.6% and SW at 9.9%. The onshore NE/ENE sector still runs 19.2%, so the biggest enemy is the morning NE sea breeze. Sessions with a morning W/SW offshore and building ESE swell are the sweet spot. Air temps warm to 16.2C, water hits 19.0C, and spring rain is frequent at 6.00 mm/day - but that same frontal activity is what keeps the swell alive. A 3/2 wetsuit is ideal and the crowds are thin.
Average Spot conditions at Niijima in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Niijima 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 Niijima for your next trip in April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Niijima 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 Niijima.