September 1st. Nothing is printed on that square of the calendar — but Japan’s old almanac gives the day a name: Nihyakutōka, “the 210th day.”
Count 210 days from Risshun, the first day of spring in the traditional calendar, and you land here. People once marked it as an unlucky day of wind. And in a small mountain town in Toyama, a festival to calm the wind still begins on this exact date every year: Owara Kaze no Bon — held over three nights, September 1st to 3rd in 2026.
How did a day you reach just by counting turn into a festival? Let’s trace it gently.
What this article covers
- Nihyakutōka is one of the zassetsu — practical seasonal markers Japan added to its calendar
- Why it was feared as “the farmers’ unlucky day”: rice flowers meet typhoon season
- An honest look at the weather data — typhoons don’t actually favor this exact day
- Owara Kaze no Bon, the festival in Yatsuo, Toyama, that prays the wind stays calm
- The festival’s origins, which come in several competing stories
- The novel Natsume Sōseki titled after this very day
- How to touch the 210th day today, no almanac required
A date you reach by counting
Nihyakutōka belongs to the zassetsu — “miscellaneous seasonal days.” Unlike the equinoxes and solstices, which came to Japan from the Chinese calendar, the zassetsu were added in Japan itself, out of the practical needs of daily life. Setsubun and the tea-picking marker Hachijūhachiya (“the 88th night”) are in the same family.
The rule could not be simpler: count 210 days from Risshun, which falls around February 4th. In 2026 that lands the 210th day on September 1st. Depending on the year it can shift to August 31st or September 2nd.
If you’ve read about Hachijūhachiya — the 88th day from Risshun, when tea picking begins — this is the same counting trick. Japan’s calendar keeps several of these “days counted from spring” tucked into the year.
Why an “unlucky day”?
Around day 210, rice plants flower and begin to set grain. A whole year of labor is finally taking shape in the paddies — the most important moment of the farming year.
And it collides head-on with typhoon season. One night of wind could flatten a crop weeks from harvest. For farmers before weather forecasts existed, little was more terrifying. So the day entered the calendar as a yakubi — a day to be on guard — and together with Hassaku (the first day of the old eighth month) and Nihyakuhatsuka (day 220), it became one of the “three great unlucky days of the farming year.”
In an age without forecasts, the calendar itself was the disaster warning.
An honest note — the typhoon doesn’t keep the appointment
Here is the part worth saying plainly. According to an article that tallied Japan’s weather records, in the 32 years from 1991 to 2022, the number of typhoons that made landfall in Japan on September 1st — the usual date of Nihyakutōka — was zero. As a “special typhoon day,” it doesn’t really hold up.
But widen the frame and the picture changes: late August through early September genuinely is one of the busiest stretches for typhoon landfalls. So the 210th day is best read not as “the day the typhoon comes,” but as a seasonal signal — from here on, stay alert.
Wrong on the exact day, right about the season. Old calendars are often like this, and it’s part of their charm.
A festival to calm the wind — Owara Kaze no Bon
Timed to this day is Owara Kaze no Bon, held in Yatsuo, a hillside town in Toyama City — every year from September 1st to 3rd. In 2026: Tuesday the 1st through Thursday the 3rd.
Despite the word “Bon” in its name, this is not the August ancestor festival. It is said to be held to calm the wind before the harvest and pray for a good crop (though another account says “bon” here comes from a local word for a day of rest).
For three nights, paper lanterns line the sloping stone streets, and eleven neighborhoods — each with its own costumes and songs — dance slowly through the narrow lanes in processions called machinagashi. The dancers hide their faces under deep woven-straw hats and never speak. Alongside shamisen and drums runs the thin, aching sound of the kokyū — a rare Japanese string instrument played with a bow. It is not a loud, exuberant festival. It is quiet, and a little sorrowful.
Its origins come in several versions. The most-told story dates it to 1702, when the townspeople recovered a precious charter document and danced for three days and nights in celebration. But even the name of the song, “Owara,” has competing explanations — from ōwara, “great bundles of straw,” to a girl from Obara village who first sang it. Nobody knows for certain. What is certain is only this: on the day of the wind, this town has kept dancing for more than three hundred years.
Sōseki wrote this day, too
One small aside: Natsume Sōseki — the novelist on the old 1,000-yen bill — published a novella titled Nihyakutōka in 1906. Two young men set out to climb the crater of Mt. Aso on, of all days, the 210th day, and walk straight into a storm. It draws on Sōseki’s own attempt to climb Aso on September 1st, 1899, abandoned in bad weather.
The title is nothing but a date — and to Japanese readers of his time, that alone said “a day of storms.” Proof of how deeply this bit of calendar had settled into everyday life.
How to touch it today
You don’t need an almanac to touch the 210th day.
On September 1st, open your weather app. Whether or not a typhoon is on the map, think: so today is day 210. In that moment you are looking in the same direction as people who counted 210 days and then looked up at the sky.
And if early September ever finds you near Toyama, walk the night streets of Yatsuo. The sound of the kokyū is the kind of sound that photographs and videos never quite manage to carry.
In closing
Nihyakutōka is not a day when something happens. It is a day for being ready — and for praying — because something might.
The data says the typhoon rarely arrives on the day itself. People counted to 210 anyway, and kept dancing to keep the wind calm. What survives in this day is something no hit-or-miss score can measure: a form, a manner, for facing the season.
September is almost here. The sound of the wind is about to change.
