Days of the week in Spanish: A helpful guide

Days of the week are masculine in Spanish. You would say for example el lunes, el martes, el miércoles, el jueves, el viernes, el sábado, and el domingo.

Days of the week are not capitalized in Spanish unless it is required by a punctuation rule like at the beginning of a sentence:

• El próximo lunes comienzan las clases.
• Sábado y domingo son mis días favoritos.

Days of the week are capitalized if they’re part of a proper name, usually for holidays, for example, Viernes Santo and Sábado de Gloria from Holy Week in Latin America.

There are formal abbreviations for the days of the week, but they’re not as common as other forms of codifications.

In this chart, you’ll find different ways to abbreviate the days of the week.

In one letter code, use an X for miércoles to avoid confusion with martes. Also, even though the days of the week are not capitalized, people often use capital letters for the one letter code option.

They can be both singular and plural. To form a plural in Spanish, you need to add an -s or -es at the end of a word. In the case of the days of the week lunes, martes, miércoles, jueves, and viernes, they already end with an -s in their singular form and won't change in their plural form. You will know if they are singular or plural by the article they use or by a number:

El lunes tengo cita con el dentista. (singular)

Los lunes tengo entrenamiento de fútbol. (plural)

Ya van 3 martes seguidos que comemos pescado. (plural)

Sábado and domingo on the other hand will add an -s to form a plural: sábados, domingos.