〜月 — Expressing Months in Japanese

Meaning & Usage

In Japanese, months are formed by combining a number (1 through 12) with the kanji 月がつ. This reading — がつ (gatsu) — applies specifically when naming a calendar month: January, February, and so on. The pattern is consistent: January is "Month 1" (一月いちがつ), February is "Month 2" (二月にがつ), and December is "Month 12" (十二月じゅうにがつ).

The kanji 月つき has two primary readings relevant here: がつ (gatsu) and つき (tsuki). When naming a specific month of the year — "in March," "during August" — you use がつ. When referring to the moon or to "month" as a general duration, you use つき. As a beginner, focus on mastering the twelve がつ forms first.

English requires memorizing twelve unrelated names — January, February, March — each with its own spelling and historical origin. Japanese has none of that irregularity. Every month is simply its number followed by 月がつ. Know the numbers 1 through 12, and you already know all twelve months.

Month names in Japanese are register-neutral. 三月さんがつ works equally in a business email, an official form, and a text to a friend. There are no polite or casual variants — the word is the same in every context.

This numbered system mirrors other Japanese counters. Attach a number and the meaning is immediately clear — the same logic applies to days of the month, years, and many other counters. Once you spot the pattern, everything clicks into place.

Structure & Formation

The structure for naming months is straightforward:

To use a month in a sentence, it typically functions as a time noun. It can appear at the start of a sentence or clause, or directly before a verb, often with the particle にに to indicate a specific point in time ("in [month]").

• Month + に + Verb — "In [month], I will do..."
• Month + は + Comment — "As for [month], it is..."
• Month + の + Noun — "[Month]'s [noun] / the [noun] of [month]"

Example Sentences

Stating the Current or Upcoming Month

Asking and Answering About Dates

Events Happening in a Specific Month

Describing Weather or Seasons by Month

Combined with Day (〜日)

Common Mistakes

Mistake 1: Using the Wrong Reading for 四月, 七月, and 九月

❌ よんがつ、なながつ、きゅうがつ ✅ 四月しがつ、七月しちがつ、九月くがつ

The single most common beginner mistake. The numbers 4, 7, and 9 each have two readings in Japanese — よん/し, なな/しち, and きゅう/く. For months, the shorter readings apply: し (shi) for April, しち (shichi) for July, and く (ku) for September. Saying よんがつ or なながつ sounds wrong to native speakers. Learn these three together — し, しち, く — and they will stick.

Mistake 2: Forgetting the Particle に for Time Expressions

❌ 三月さんがつ日本にほんへ行いきます。

✅ 三月さんがつに日本にほんへ行いきます。

When a month indicates the specific time that an action takes place, the particle に (ni) is required after it. This is the time particle, equivalent to "in" or "on" in English. Without に, the sentence is grammatically incomplete. However, broad time words like 今日 (today), 今月 (this month), and 来月 (next month) do not take に — only specific calendar months do.

Mistake 3: Confusing がつ (gatsu) and げつ (getsu)

❌ 一月いちげつ、三月さんげつ ✅ 一月いちがつ、三月さんがつ

The reading げつ (getsu) appears in compound words like 月曜日げつようび (Monday) and 毎月まいつき (every month). It is not used when naming the months of the year. When counting months as a duration (e.g., "for three months"), the counter ヶ月かげつ is used — yet another distinct pattern. Note these differences early so they do not blur together later.

Mistake 4: Mixing Up 何月 (nangatsu) and 何ヶ月 (nankagetsu)

❌ 何月なんがつかかりますか。(when asking duration)

✅ 何ヶ月なんかげつかかりますか。

何月なんがつ means "which month?" and asks which month of the year something occurs. 何ヶ月なんかげつ means "how many months?" and asks about a duration. If you want to ask "In what month does it start?" use 何月. If you want to ask "How many months does it take?" use 何ヶ月.

Mistake 5: Writing the Month Before the Year When Speaking

❌ 三月さんがつ二千二十六年にせんにじゅうろくねん ✅ 二千二十六年にせんにじゅうろくねん三月さんがつ

Japanese dates follow largest to smallest: Year → Month → Day. This is the opposite of the American convention (Month/Day/Year) and different from the European convention as well. Always place the year first, then the month, then the day. This applies to both spoken and written Japanese.

Cultural Notes

The Japanese calendar system traditionally uses the Imperial Era (元号, gengō) alongside the Western calendar. For example, the year 2026 is also 令和れいわ8年 (Reiwa 8). However, the month names themselves — using 〜がつ — are identical in both systems. Whether you say 2026年3月 or 令和8年3月, the month is always 三月さんがつ.

Many months in Japan are strongly associated with specific cultural events and seasonal imagery. 三月さんがつ (March) is graduation season and the time of cherry blossoms (桜さくら). 四月しがつ (April) marks the start of the new school year and fiscal year — one of the most significant transitions on the Japanese cultural calendar. 八月はちがつ (August) is associated with お盆おぼん (Obon), a time to honor ancestors, and large summer fireworks festivals (花火大会はなびたいかい).

十二月じゅうにがつ (December) is called 師走しわす in classical Japanese — a poetic name meaning roughly "even masters run" due to the busyness of year-end. While classical month names are rarely used in modern everyday speech, you may encounter them in literature, poetry, traditional events, or on decorative calendars.

Month vocabulary comes up constantly: booking appointments, reading schedules, filling out forms, or just talking about the weather. It is one of the first things you will actually use outside a classroom.

Related Grammar Points

• 〜時 — O'Clock (Grammar N5)
• Days of the Month: 〜日 (Grammar N5)
• もう — Already, Not Anymore, One More (Grammar N5)
• に (ni) — Direction, Time, and Location Particle (Grammar N5)
• 〜人: Counting People in Japanese (Grammar N5)
• まだ — Still, Not Yet (Grammar N5)

JLPT Tips

On the JLPT N5 exam, questions about months typically appear in the kanji reading section (文字・語彙). You will be given a word like 四月しがつ or 九月くがつ and asked to select the correct reading from four choices. The most commonly tested months are the three with irregular number readings: 四月しがつ, 七月しちがつ, and 九月くがつ. Wrong answer choices will offer よんがつ, なながつ, and きゅうがつ to catch students who apply standard number readings.

Month vocabulary also appears in the listening section (聴解). You might hear a conversation about someone's birthday, a scheduled trip, or the start of a class and be asked to identify which month is mentioned. Listening practice is especially important for 七月しちがつ (shichigatsu) and 一月いちがつ (ichigatsu), as these can sound similar at natural speaking speed.

In the reading comprehension section, months often appear in schedules, notices, or short messages. Make sure you can read all twelve months at a glance without needing to sound them out.

Pairing each month with a Japanese holiday makes it easier to remember: 一月いちがつ → お正月おしょうがつ (New Year), 三月さんがつ → ひな祭まつり (Hinamatsuri), 五月ごがつ → こどもの日ひ (Children's Day). Tying a month to a real event makes it stick far better than drilling a list.

Finally, practice writing full dates — Year + Month + Day — until it feels automatic. This reinforces month vocabulary and prepares you for date-related questions across both the reading and listening sections.