Every Japanese weekday ends with 曜日 (yō-bi), meaning “day of the week.” Put one element in front and the day is complete: 月曜日 (ge-tsu-yō-bi) is Monday, 火曜日 (ka-yō-bi) is Tuesday, and 金曜日 (kin-yō-bi) is Friday.
The seven opening kan-ji mean moon, fire, water, wood, gold, earth, and sun. That gives you a ready-made set of pictures—and a hidden tour of the planets—to make the words stick.
Japanese days of the week: quick reference
The long bar in yō-bi marks a held vowel. Give yō about twice the length of a short yo: the rhythm is ge-tsu-YŌ-bi, not ge-tsu-yo-bi.
| English | Kanji | Hiragana | Romaji | Memory image |
|---|---|---|---|---|
| Monday | 月曜日 | げつようび | ge-tsu-yō-bi | moon |
| Tuesday | 火曜日 | かようび | ka-yō-bi | fire / Mars |
| Wednesday | 水曜日 | すいようび | su-i-yō-bi | water / Mercury |
| Thursday | 木曜日 | もくようび | mo-ku-yō-bi | wood / Jupiter |
| Friday | 金曜日 | きんようび | kin-yō-bi | gold / Venus |
| Saturday | 土曜日 | どようび | do-yō-bi | earth / Saturn |
| Sunday | 日曜日 | にちようび | ni-chi-yō-bi | sun |
Read the kan-ji column vertically: 月・火・水・木・金・土・日. Those seven symbols are the compact labels you will see across Japanese calendars.
One ending, seven picture words
The pattern is [element] + 曜日. You never need to change the ending, so focus your memory on the first one or two sounds:
- ge-tsu from 月, moon
- ka from 火, fire
- su-i from 水, water
- mo-ku from 木, wood/tree
- kin from 金, gold/metal
- do from 土, earth/soil
- ni-chi from 日, sun/day
If you enjoy visual stories, imagine a moon falling into fire, the fire being put out by water, water feeding a tree, a gold coin hanging from the tree, the coin dropping into soil, and the sun rising over it all. Walk through the story from Monday to Sunday while saying each full word.
Do not try to memorize seven four- or five-syllable sounds as solid blocks. Drill only the changing openings—ge-tsu, ka, su-i, mo-ku, kin, do, ni-chi—then attach the same yō-bi ending to each one. It cuts the job almost in half.
Why the days are planets in disguise
The characters are called the seven luminaries: the sun, moon, and five planets visible without a telescope. Classical Chinese astronomy linked those planets with five elements, and Japan adopted the weekday system centuries ago.
The matching pattern also lives inside the Japanese planet names. Mars is 火星 (ka-sei, fire star), Mercury is 水星 (su-i-sei, water star), Jupiter is 木星 (mo-ku-sei, wood star), Venus is 金星 (kin-sei, gold star), and Saturn is 土星 (do-sei, earth star).
English and Japanese preserve different faces of the same ancient seven-day idea. Monday is a moon day in both languages, Sunday is a sun day, and Saturday aligns with Saturn. English replaced several Roman gods with Norse ones; Japanese kept the planet-element set inherited through China.
You do not need the history to book a table on Friday. But it turns an arbitrary list into a system—and systems are easier to remember.
Ask “What day is it?”
The standard polite question is 今日は何曜日ですか (Kyō wa nan-yō-bi de-su ka?)—“What day is it today?” Here, 何曜日 means “what weekday.” Answer with the day plus です:
今日は何曜日ですか。
Kyō wa nan-yō-bi de-su ka?
What day is it today?
今日は水曜日です。
Kyō wa su-i-yō-bi de-su.
Today is Wednesday.
金曜日に会いましょう。
Kin-yō-bi ni a-i-ma-shō.
Let’s meet on Friday.
土曜日は空いていますか。
Do-yō-bi wa a-i-te i-ma-su ka?
Are you free on Saturday?
毎週月曜日に日本語を勉強します。
Ma-i-shū ge-tsu-yō-bi ni Ni-hon-go o ben-kyō shi-ma-su.
I study Japanese every Monday.
Use に after a specific day when it marks the time of an action: 火曜日に行きます means “I’ll go on Tuesday.” Use は when you make the day the topic or contrast it with another day: 土曜日は空いています suggests “As for Saturday, I’m free.” In casual conversation, に is sometimes dropped when the timing is already obvious.
Today, tomorrow, and the weeks around you
These words turn the seven labels into an actual schedule.
| Meaning | Japanese | Reading | Romaji |
|---|---|---|---|
| today | 今日 | きょう | kyō |
| tomorrow | 明日 | あした | a-shi-ta |
| yesterday | 昨日 | きのう | ki-nō |
| this week | 今週 | こんしゅう | kon-shū |
| next week | 来週 | らいしゅう | ra-i-shū |
| last week | 先週 | せんしゅう | sen-shū |
| weekday | 平日 | へいじつ | hei-ji-tsu |
| weekend | 週末 | しゅうまつ | shū-ma-tsu |
| every week | 毎週 | まいしゅう | ma-i-shū |
週末 is beautifully literal: 週 week + 末 end. 来週 imagines the week that is coming; 先週 points to the week before.
Read a Japanese calendar in seconds
Calendars and train-app date pickers commonly show just one large kan-ji after the date:
| Calendar label | Full day | Meaning |
|---|---|---|
| 月 | 月曜日 | Monday |
| 火 | 火曜日 | Tuesday |
| 水 | 水曜日 | Wednesday |
| 木 | 木曜日 | Thursday |
| 金 | 金曜日 | Friday |
| 土 | 土曜日 | Saturday |
| 日 | 日曜日 | Sunday |
The same characters often appear inside colored circles, with Sunday in red and Saturday in blue on many printed calendars. Color is a helpful clue, but the kan-ji is the reliable part.
There is an extra payoff: these are among the most useful beginner kan-ji. 月 appears in “month” and “moon,” 日 in dates and “Japan,” 水 in “water,” and 木 in “tree.” Learning weekdays quietly unlocks vocabulary far beyond the calendar.
Pronunciation and spelling traps
Three small details make the days sound much more natural:
- Hold the long ō in every yō-bi.
- The hyphens mark pronunciation chunks: say kin-yō-bi, never ki-nyō-bi.
- Ge-tsu-yō-bi begins ge-tsu, with a light final u that may sound very faint in fast speech.
You may hear abbreviated spoken forms such as ge-tsu-yō or kin-yō when the context is obvious. As a beginner, the full -yō-bi form is clearer and always safe.
A one-minute practice round
Answer from memory:
- Which day begins with the water kan-ji 水? (Wednesday.)
- What is 金曜日? (Friday, “gold day.”)
- Add the time particle to Tuesday. (火曜日に.)
- How do you say weekend? (週末, shū-ma-tsu.)
- Decode 来週の月曜日. (“Next Monday.”)
Now look at today’s date on your phone, switch the calendar language to Japanese for ten seconds, and find the one-kanji weekday label. That tiny act gives the word a real home.
Common questions
Does a Japanese week start on Sunday or Monday?
Both layouts exist. Some printed calendars begin with Sunday, while business schedules commonly frame Monday as the start of the working week. Read the kan-ji headers instead of guessing from position.
Can I say the day without 曜日?
Short forms such as 月曜 (ge-tsu-yō) and 金曜 (kin-yō) are common in schedules and casual speech. Learn the full forms first, then the abbreviations will feel automatic.
Is 明日 always read a-shi-ta?
In everyday speech, a-shi-ta is the safest beginner reading. The same characters can be read a-su in more formal expressions and myō-ni-chi in very formal language.
Keep learning Japanese
You can now read the week in full words or one-kanji calendar labels, ask the day, and arrange a Saturday plan. Put that knowledge into conversation with our free essential Japanese phrases. For a week-long memory game, say today’s element every morning—moon, fire, water, wood, gold, earth, sun—then give its full Japanese day name.
