Conditions at Shonan in October
October: Autumn Winds Peak and the Waiting Game Ends
October is statistically Shonan's most reliable month for clean surf. The ideal-wind reading hits its annual high of 20%, driven by a strong NNE flow (32.3%) with N (12.2%) and NNW (4.9%) support. This is offshore, grooming wind. Swell-wise, the average height is 2.3ft (0.7m) but the period runs 8.7s, giving the waves a punchy, organized feel. The direction mix is broader than summer: SE (17.3%) and SSE (14.7%) lead, with S (11.8%), SSW (8.7%) and ESE (11.4%) in the mix. This often reflects a combination of typhoon remnants and early-season mid-latitude lows spinning up in the East China Sea. Air temperatures cool to 16.1C, water remains warm at 22.9C, and precipitation is still significant at 6.51mm/day. October is the month to keep the shortboard close; offshore wind and south-quadrant swell can finally line up for quality sessions.
Average Spot conditions at Shonan in October
Swell history for October
Wind history for October
Swell quality
Analyze the groundswell consistency at Shonan during October. 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 October.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Shonan for October. 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.