Conditions at Niijima in January
January: Deep Winter, Short-Period Power
January sits at the top of the swell-height calendar with an average 1.8m (6ft), but the 6.9s average period is a red flag: this is windswell-dominated surf. Directionally, W swell accounts for a massive 33.4% of the spectrum, with WSW and WNW adding another 11.9%. For an east-facing beach, the money directions - NE, ENE, E, ESE and SE - make up only 23.8% combined, led by ENE at 10.9% and NE at 6.1%. The waves are there, but they often need a lot of sorting out.
Wind is the winter villain. The Siberian high strengthens and the NW monsoon rips across Japan, producing WNW winds 23.9% of the time and W winds 17.4% of the time, frequently in the 40-50kph bracket. Those are offshore directions for the east-facing spot, but they are so strong they tear the faces apart. The NE/ENE onshore sector contributes 14.2% and further limits clean windows. Ideal surf wind is present only 11% of the time. Your best bet is a temporary high-pressure ridge that lightens the WNW flow while a low-pressure trough in the Kuroshio extension pushes a pulse of longer-period ENE swell - then 6-8ft (1.8-2.4m) sets can line up with only light chop. Air temps average 11.2C, water is 18.2C, and precipitation is relatively low at 2.82 mm/day.
Average Spot conditions at Niijima in January
Swell history for January
Wind history for January
Swell quality
Analyze the groundswell consistency at Niijima during January. 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 Niijima for your next trip in January.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Niijima for January. 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 Niijima.