Conditions at Katahama in March
March: Transitional Energy
March is a transition month where the winter wind regime begins to weaken and spring patterns emerge. The offshore wind share (W+WNW+NW+NNW) still sits at a healthy 44.2%, but the strength is less extreme. The swell distribution is much more balanced: E (12.2%), ESE (10.7%), SE (7.4%), and SSE (5.9%) together make up 36.2% of the waves, while WNW (14.1%) and W (10.8%) remain significant. This mix means more swells arrive from the optimal east-southeast quadrant, and with the average period improving to 7.6s, waves begin to hold up better. On days when the morning offshore W/NW wind meets an incoming E/ESE swell, Katahama offers user-friendly, rippable surf in the 1-1.5m (3-5ft) range. Air temps climb to 12.0°C, water temps stay cool at 15.1°C, but precipitation jumps to 5.12 mm/day as spring systems bring more rain.
Average Spot conditions at Katahama in March
Swell history for March
Wind history for March
Swell quality
Analyze the groundswell consistency at Katahama during March. 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 March.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Katahama for March. 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.