Days of the week in Spanish: lunes to domingo

The seven days of the week in Spanish are lunes, martes, miércoles, jueves, viernes, sábado and domingo. They are all masculine (el lunes, el sábado) and, unlike in English, they are written in lowercase — lunes, not Lunes — even in the middle of a sentence.

One more thing to keep in mind: the Spanish week starts on Monday (lunes), so the weekend (el fin de semana) is the last block, with sábado and domingo. Below are the days and the weekend with audio and an example each, then the sections explain the accents, how to say “on Monday”, and how the plurals work.

The seven days

Going from the start of the week, the days are lunes (Monday), martes (Tuesday), miércoles (Wednesday), jueves (Thursday), viernes (Friday), sábado (Saturday) and domingo (Sunday). Only two of them carry a written accent: miércoles and sábado. The other five have none, so be careful not to add accents that are not there.

Hoy es lunes y mañana es martes.
Today is Monday and tomorrow is Tuesday.

Remember that these are common nouns in Spanish, so they stay lowercase. You only write a capital letter when the day happens to begin a sentence, exactly as you would with any other word.

Mi día favorito es el sábado.
My favorite day is Saturday.

Saying “on Monday” with el and los

To say something happens on a day, Spanish does not use a preposition like on or en — it uses the article. El lunes means “on Monday” (one specific Monday), and los lunes means “on Mondays”, that is, every Monday as a habit.

Te veo el jueves.
I’ll see you on Thursday.

Tengo clase los martes.
I have class on Tuesdays.

Because the day already tells you “when”, you can pin an action to it without any extra word. To add the exact hour, combine the day with telling time in Spanish, as in el lunes a las nueve (on Monday at nine).

Weekday plurals and the weekend

Here is the handy part: the five weekdays that end in -s —lunes, martes, miércoles, jueves, viernes— look exactly the same in the plural. Only the article changes, from el to los. The two weekend days are the exception: sábado and domingo add an -s to become los sábados and los domingos.

For the weekend itself, use el fin de semana (the weekend); the working days together are entre semana (on weekdays). The fixed phrase “from Monday to Friday” drops the articles: de lunes a viernes.

Trabajo de lunes a viernes y descanso el fin de semana.
I work from Monday to Friday and rest on the weekend.

Entre semana me levanto temprano.
On weekdays I get up early.

Common mistakes

Capitalizing the day

In Spanish the days are common nouns, so they stay lowercase even in the middle of a sentence.

Voy el Lunes. → Voy el lunes.
I’m going on Monday.

Using en for “on a day”

To say “on” a day, use the article el or los, never the preposition en.

Trabajo en lunes. → Trabajo el lunes.
I work on Monday.

Adding -s to the -s days

Days that already end in -s keep the same form in the plural; only the article changes, so do not invent a form like luneses.

Descanso los luneses. → Descanso los lunes.
I rest on Mondays.

In Fluera you practice the days inside real plans — saying tengo clase los martes or descanso el fin de semana — so choosing el or los for “on a day” becomes automatic instead of a rule you translate each time. Put a week of your own routine into Spanish when you practice Spanish.

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