The Calendar Says Autumn Before the Weather Does

In Japan's traditional seasonal calendar, autumn begins surprisingly early.

One important marker is Risshū (立秋), usually translated as “the beginning of autumn.” It falls in early August and is one of the 24 traditional seasonal divisions known as nijūshi sekki (二十四節気).

If you have ever experienced August in Japan, this may sound strange.

August is often intensely hot and humid. It certainly does not feel like the autumn of cool mornings and colorful leaves.

But these traditional seasonal divisions are not simply descriptions of the weather on a particular day. They mark the gradual progression of the year.

In other words, a season can begin to turn before the change becomes obvious.

By the time September arrives, the traditional calendar has already been pointing toward autumn for several weeks.

Everyday experience, however, may tell a different story.

September Still Carries Summer

Early September in Japan often feels like summer has simply continued into another month.

Depending on the year and region, daytime temperatures can remain high. Humidity may linger, and summer clothing is still completely normal.

This is also worth remembering if you are planning a September trip to Japan.

Images of temples surrounded by brilliant red maple leaves may represent Japanese autumn beautifully, but they usually do not represent early September. In many parts of the country, the famous autumn foliage season comes considerably later.

September occupies a different space.

Summer has not disappeared.

But it is no longer completely unchanged.

The First Signs Are Small

Perhaps you notice it in the morning.

For a brief moment, the air feels lighter than it did a few weeks ago.

Or perhaps it happens in the evening.

The sun disappears a little earlier. The light falls differently across a familiar street. The sky seems to have changed. New sounds begin to emerge from the grass after sunset.

Along roadsides and riverbanks, plants begin to hint at another season.

None of these changes announces:

“Autumn begins today.”

Instead, one small sign follows another.

A slightly cooler evening.

A changing sky.

A different sound outside the window.

A flower appearing beside a path.

And eventually, there comes a moment when you find yourself thinking:

It feels a little like autumn today.

That feeling may be one of the most interesting parts of September in Japan.

Autumn can be present before it has fully arrived.

Not Only the Four Seasons, but the Space Between Them

Japan is often described through its four seasons.

Cherry blossoms evoke spring.

Cicadas and festivals suggest summer.

Red maple leaves symbolize autumn.

Snow-covered landscapes represent winter.

But focusing only on these familiar images can hide something quieter.

Japanese culture has also paid attention to the transitions between seasons.

Traditional poetry contains seasonal references connected to very particular moments in the year. Old names for the months reflect earlier ways of imagining the seasonal cycle. Flowers, insects, the moon, wind, rain, and changes in the atmosphere have all become ways of noticing time passing.

This does not mean that every person in Japan consciously observes every seasonal change.

Rather, traces of this attention remain in Japanese language, customs, literature, and everyday culture.

There are words for a season beginning to show itself.

There are sounds strongly associated with certain times of year.

There are flowers valued for quietly appearing at a particular seasonal moment.

There are customs that ask people simply to look up at the moon.

September brings many of these subtle signs together.

Autumn Before the Red Leaves

For many visitors, autumn in Japan means kōyō (紅葉) — the brilliant red and yellow foliage that transforms mountains, temples, gardens, and parks later in the season.

It is one of the great sights of the Japanese year.

But autumn does not begin with red leaves.

Long before the landscape becomes dramatically colorful, another autumn is already taking shape.

A quieter one.

You may find it in the evening air.

In a sound from the grass.

In the shape of clouds above the city.

In plants growing beside a river.

In the moon over an ordinary neighborhood.

Summer is still visible.

Yet something else has begun to appear beside it.

So When Does Autumn Begin?

The traditional calendar gives one answer.

Meteorology can give another.

Temperature records can give another still.

But everyday experience offers something less precise.

For one person, autumn may begin with the first noticeably cool evening.

For another, it may be a different sound outside an open window.

Someone else may notice the changing light.

Another person may realize it when seasonal foods begin appearing in shops.

None of these moments needs to be the single “correct” beginning of autumn.

Perhaps seasons do not always arrive like a door opening from one room into another.

They overlap.

Summer remains while autumn begins.

For a while, both seem to exist together.

Then one day, almost without noticing exactly when it happened, the balance has changed.

Perhaps autumn begins not when the calendar changes, but when you first notice that the world around you has begun to change.

There is a Japanese word that fits naturally with this feeling: 気配 — kehai.

It can describe something that is not yet clearly visible, but whose presence can somehow be felt.

Next in the Kizuna language series:
Kehai (気配): A Japanese Word for Something You Can Feel but Cannot Quite See

A Month of Small Signs

Throughout September, we will follow some of these small changes across Japan.

We will listen.

We will look upward.

We will notice flowers and grasses.

We will explore seasonal traditions and the ways people have marked this changing time of year.

And eventually, we will look toward the autumn moon.

None of these things alone defines autumn.

Together, however, they create a sense that another season is approaching.

For now, there is no need to search for anything dramatic.

The next time you step outside, simply notice what has changed.

The light.

The air.

The sound.

The sky.

Sometimes a new season begins there.

What is the first sign that tells you autumn has arrived where you live?

September Series: Sensing Autumn in Japan

• 9/1 When Does Autumn Really Begin in Japan? (this article)
• 9/5 The First Signs of Autumn in Japan （Coming Soon）
• 9/9 Why Insect Sounds Feel Like Autumn in Japan （Coming Soon）
• 9/13 Why September Skies Feel Different in Japan （Coming Soon）
• 9/17 The Seven Flowers of Autumn: Japan's Quiet Seasonal Beauty （Coming Soon）
• 9/21 Higan: When Japan Marks the Changing Season （Coming Soon）
• 9/25 Tsukimi: Why Japan Looks Up at the Autumn Moon （Coming Soon）
• 9/27 Sensing Autumn in Japan: A Quiet Guide to September （Coming Soon）

This September series follows the quiet arrival of autumn through changing light, sounds, skies, plants, traditions, and the moon — exploring how a season can be felt before it fully appears.