Days of the week

The Days of the Week

Days of the week in Spanish are always masculine and are not capitalized.

EnglishSpanish
Mondayel lunes
Tuesdayel martes
Wednesdayel miércoles
Thursdayel jueves
Fridayel viernes
Saturdayel sábado
Sundayel domingo

Saying "On" a Specific Day

You don't need a translation for "on" with days of the week. Just use the singular definite article el.

On Monday we visit the museum.
El lunes visitamos el museo.
I do not work on Saturday and Sunday.
No trabajo el sábado y el domingo.

Recurring Days (Plural)

If something happens regularly, use the plural article los.

Because Monday through Friday already end in -s, the day itself doesn't change (los lunes). For Saturday and Sunday, add an -s to the end of the word (los sábados, los domingos).

We visit the park on Saturdays.
Visitamos el parque los sábados.
Classes finish on Tuesdays and Thursdays.
Las clases terminan los martes y los jueves.