Conditions at Katahama in October
October: The Magic Balance
October is when the stars align for Katahama. The swell direction is still excellent - E (24.4%), ESE (24.3%), SE (11.5%), SSE (8.6%) total a whopping 68.8% optimal, the highest of any month. Meanwhile, the wind regime starts to shift back toward the winter pattern: W (12.5%), WNW (5.2%), NW (1.8%), and NNW (2.7%) combine for 22.2% offshore flow - still not massive, but the frequency of E/SE onshore winds (ENE 23.2%, NE 16.5%, E 11.7%) is tempered by these offshore pulses. The average period remains healthy at 8.8s, and the height sits at 1.3m (4ft). The result is a month where you can routinely find clean, rippable surf on the E/ESE swells when a high-pressure ridge noses in behind a front, delivering W/NW offshore winds. It's the classic autumn tune in Japan: warm air (21.0°C), still-warm water (23.2°C), and the first solid taste of groundswell for the season. Precipitation is high at 7.24 mm/day, but the showers are usually short and sharp between fronts.
Average Spot conditions at Katahama in October
Swell history for October
Wind history for October
Swell quality
Analyze the groundswell consistency at Katahama 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 Katahama for your next trip in October.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Katahama 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 Katahama.