Conditions at Oniguchi in May
May: Small, Groveling and Grainy
May sees the annual swell average bottom out at 0.9m (3ft), with a period of 7.1s. The dominant swell directions switch fully to the east: E is 15.6%, ESE is 19.6% and SE is 10.8%. The SW sector contributes about 19%, but the prevailing winds become less helpful-ideal offshore wind is present only 43% of the time. The wind rose shows a mix of NW at 13.3%, E at 11.7%, ESE at 10.8% and NNW at 10.1%. Air temperatures warm to 21.2°C, water temperature reaches 21.7°C, and precipitation remains high at 7.19 mm/day. This is the start of the groveling season at Oniguchi. Expect small, soft, mostly wind-affected surf, with occasional fun summer pulses when a passing tropical system aligns with an offshore wind shift.
Average Spot conditions at Oniguchi in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Oniguchi during May. 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 Oniguchi for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Oniguchi for May. 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 Oniguchi.