Conditions at Sendai in December
December: Winter Monsoon Peak with Classic Sendai Grit
December closes the year with reliable winter surf and the second-highest clean-wind percentage at 52%. Average height is 3ft (1.0m), period is 9.3s, and the offshore WNW/NW wind machine is running at full strength. Swell distribution is more mixed than November - ESE (13.3%), E (9.3%), ENE (9.6%), SE (10.8%) and WNW (11.0%) - as the winter monsoon cranks out local windswell along with distant storm swell. It can be raw, with water temp dropping to 12.7°C and air temps averaging 3.6°C, but the trade-off is a high frequency of groomed, lined-up waves. For the committed surfer, December is a classic month: cold air, offshore wind, and steady east-southeast groundswell.
Average Spot conditions at Sendai in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sendai during December. 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 Sendai for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sendai for December. 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 Sendai.