Conditions at Sendai in September
September: Typhoon Energy Meets the Autumn Transition
September marks the first serious uptick. The average height is 3.5ft (1.1m), period is 9.1s, and ideal wind improves to 35%. ESE swell is dominant at 35.8%, with E (23.5%), SE (20.8%) and ENE (6.9%) all in the mix. Typhoons and early extratropical lows generate some of the most powerful swell of the year, and the wind patterns begin to shift back toward NW offshore flow. The water remains warm at 23.0°C and air temps average 20.9°C, so a good September day can feel like a gift. Expect inconsistent but rewarding pulses, especially after a typhoon recurves and a westerly wind cleans the surface beneath it.
Average Spot conditions at Sendai in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Sendai during September. 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 September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sendai for September. 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.