What are the days of the week in Spanish?

Lunes (Monday), martes (Tuesday), miércoles (Wednesday), jueves (Thursday), viernes (Friday), sábado (Saturday), domingo (Sunday). All lowercase, all masculine. Spanish week starts on Monday.

Why is el lunes singular but lunes can also be plural?

Days ending in -es (lunes-viernes) have the SAME form for singular and plural. The article carries the number: el lunes (one Monday) vs. los lunes (every Monday). Sábado and domingo do add -s for plural.

What's the difference between el lunes and los lunes?

El lunes = ONE specific Monday (usually this week). Los lunes = EVERY Monday (habitual). El lunes voy al gimnasio = I'm going to the gym on Monday. Los lunes voy al gimnasio = I go to the gym on Mondays.

Do I need a preposition before days of the week?

No. Spanish does NOT use en, a, or on with days. Just el / los + day. Te veo el viernes (not en viernes). Trabajo los lunes (not en lunes).

Why are days of the week not capitalized in Spanish?

Spanish convention treats days (and months) as common nouns, always lowercase. Capitalize only if starting a sentence. English's capitalization rule doesn't apply.

Spanish grammar · Beginner

Days of the Week in Spanish

Written by Sofia Ramirez, Lead Spanish Curriculum Editor · Reviewed May 2026

Spanish has seven days, all masculine and starting with lowercase: lunes, martes, miércoles, jueves, viernes, sábado, domingo. The week starts on Monday in Spanish convention. Use el / los (no preposition) for on Monday or every Monday.

El lunes voy al gimnasio.

On Monday I go to the gym.

What it is

Spanish has seven days, all masculine and starting with lowercase letters: lunes, martes, miércoles, jueves, viernes, sábado, domingo. The week starts on MONDAY in Spanish convention (not Sunday). Use el (specific day, e.g., this Monday) or los (every Monday), no need for a preposition like en or on.

El lunes voy al gimnasio = On Monday (this Monday) I go to the gym. Los lunes voy al gimnasio = On Mondays (every Monday) I go to the gym.

How to spot it

Days are always lowercase in Spanish (unlike English). Most end in -es and are invariable in plural, only sábado / domingo add -s (sábados, domingos).

Hoy es martes. — Today is Tuesday.
El sábado vamos al cine. — On Saturday we're going to the movies.
Los viernes hago yoga. — On Fridays I do yoga.

Spanish days are masculine, el lunes, el martes. Never la lunes. Plural for most: los lunes, los martes (same form), los viernes (same).

Days of the Week in Spanish Quick Reference

Days of the week in Spanish

English	Spanish (sg.)	Plural	Origin
Monday	lunes	los lunes (same)	from Luna (Moon)
Tuesday	martes	los martes (same)	from Marte (Mars)
Wednesday	miércoles	los miércoles (same)	from Mercurio
Thursday	jueves	los jueves (same)	from Júpiter / Jove
Friday	viernes	los viernes (same)	from Venus
Saturday	sábado	los sábados	from Sabbath
Sunday	domingo	los domingos	from Dominus (Lord)

Common Days of the Week in Spanish Examples in Spanish

Days of the week in real contexts:

El + Day, Specific Day

El lunes tengo clase.: On Monday (this coming Monday) I have class.
El sábado pasado fui al cine.: Last Saturday I went to the movies.
El miércoles que viene...: Next Wednesday...

El + day refers to ONE specific day, usually this week. Use pasado / que viene / próximo for past or upcoming.

Los + Day, Every Week

Los lunes voy al gimnasio.: On Mondays (every Monday) I go to the gym.
Los viernes salgo con amigos.: On Fridays I go out with friends.
Los sábados duermo hasta tarde.: On Saturdays I sleep in.

Los + day = every week (habitual). Equivalent to English on Mondays.

Hoy Es / Mañana Es, Today / Tomorrow

Hoy es martes.: Today is Tuesday.
Mañana es miércoles.: Tomorrow is Wednesday.
Ayer fue lunes.: Yesterday was Monday.

After hoy es / mañana es / ayer fue, NO article, the day stands alone.

No Preposition Needed

Te veo el viernes. (NOT en viernes): I'll see you on Friday.
Trabajo los lunes. (NOT en lunes): I work on Mondays.

Spanish does NOT use en / a / on with days of the week. Just el / los + day.

How to Use Days of the Week in Spanish

Lowercase and Masculine

Days are always lowercase (unlike English). All seven are masculine, never la lunes.

el lunes, el martes, el miércoles, el jueves, el viernes, el sábado, el domingo.

Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday.

Capitalize only when starting a sentence.

El (Specific) vs. Los (Habitual)

El + day = ONE specific day (usually this week). Los + day = every week (habitual).

El lunes voy. = On Monday (this Monday) I go. Los lunes voy. = On Mondays (every Monday) I go.

Big meaning difference between el and los.

If you mean every X, use los. For just one upcoming, use el.

No Preposition

Spanish does NOT use a / en / on before days. Just el / los + day handles the on meaning.

Te veo el viernes. Trabajo los lunes.

I'll see you on Friday. I work on Mondays.

If you'd say en lunes (literally in Monday), that's wrong. Just el lunes.

Plural Forms, Mostly Same

Days ending in -es (Monday-Friday) are invariable in plural, same form. Sábado and domingo add -s (sábados, domingos).

los lunes, los martes, los miércoles, los jueves, los viernes. los sábados, los domingos.

Mondays, Tuesdays, Wednesdays, Thursdays, Fridays. Saturdays, Sundays.

Article (los) carries the plural meaning; the day's form stays unchanged for Mon-Fri.

Common Mistakes with Days of the Week in Spanish

Incorrect: Te veo en lunes. — I'll see you on Monday. (wrong, no en)

Correct: Te veo el lunes. — I'll see you on Monday.

Spanish doesn't use en or a with days. Just el / los + day already conveys on.

Incorrect: Los Sábados voy al cine. — On Saturdays I go to the movies. (wrong, lowercase)

Correct: Los sábados voy al cine. — On Saturdays I go to the movies.

Spanish days are always lowercase, unless they start a sentence.

Incorrect: Hoy es el martes. — Today is Tuesday. (wrong, no article)

Correct: Hoy es martes. — Today is Tuesday.

After hoy es / mañana es / ayer fue, drop the article. Just the bare day.

El + Day vs. Los + Day, Once vs. Every

El + Day = Specific Day

Refers to one particular day, usually the upcoming one this week, or a past one with pasado / fue.

El lunes tengo dentista.: On Monday I have the dentist.
El sábado pasado lo vi.: Last Saturday I saw him.
El domingo que viene viajamos.: Next Sunday we're traveling.

Use pasado / próximo / que viene to clarify past or future.

Los + Day = Every Week

Refers to a habitual / recurring action on that day of the week. Equivalent to English on Mondays.

Los martes tengo yoga.: On Tuesdays I have yoga.
Los viernes cenamos fuera.: On Fridays we eat out.

Singular vs. plural changes meaning entirely. El lunes (this Monday) vs. Los lunes (every Monday).

Days of the Week in Spanish FAQs

What are the days of the week in Spanish?: Lunes (Monday), martes (Tuesday), miércoles (Wednesday), jueves (Thursday), viernes (Friday), sábado (Saturday), domingo (Sunday). All lowercase, all masculine. Spanish week starts on Monday.
Why is el lunes singular but lunes can also be plural?: Days ending in -es (lunes-viernes) have the SAME form for singular and plural. The article carries the number: el lunes (one Monday) vs. los lunes (every Monday). Sábado and domingo do add -s for plural.
What's the difference between el lunes and los lunes?: El lunes = ONE specific Monday (usually this week). Los lunes = EVERY Monday (habitual). El lunes voy al gimnasio = I'm going to the gym on Monday. Los lunes voy al gimnasio = I go to the gym on Mondays.
Do I need a preposition before days of the week?: No. Spanish does NOT use en, a, or on with days. Just el / los + day. Te veo el viernes (not en viernes). Trabajo los lunes (not en lunes).
Why are days of the week not capitalized in Spanish?: Spanish convention treats days (and months) as common nouns, always lowercase. Capitalize only if starting a sentence. English's capitalization rule doesn't apply.