Spanish Days of the Week FAQ

In order from Monday (the first day of the week in Spanish-speaking countries): lunes (Monday), martes (Tuesday), miercoles (Wednesday), jueves (Thursday), viernes (Friday), sabado (Saturday), and domingo (Sunday). The Spanish week starts on Monday per the ISO 8601 international standard, unlike the US Sunday-first calendar.

No. Days of the week in Spanish are not capitalized mid-sentence. You write 'el lunes', not 'el Lunes'. They are only capitalized when they start a sentence: 'Lunes es mi dia favorito.' This rule also applies to months and nationalities in Spanish -- all lowercase mid-sentence, unlike English where days and months are always capitalized.

El lunes means 'on Monday' (this specific upcoming Monday): 'El lunes tengo reunion' (I have a meeting on Monday). Los lunes means 'on Mondays' (every Monday, a habitual action): 'Los lunes voy al gimnasio' (I go to the gym on Mondays). After the verb ser, no article is used: 'Hoy es lunes' (Today is Monday). This is one of the most common grammar questions for both learners and heritage speakers.

Miercoles is pronounced approximately 'mee-AIR-koh-less' with the stress on the first syllable. The IPA is /ˈmjeɾ.ko.les/ in Latin American Spanish and /ˈmjer.ko.les/ in Castilian. The 'c' before 'o' is a hard /k/ sound -- not the /th/ sound that appears in Castilian for words like 'cinco'. Use the audio toggle on the homepage to hear both accents.

Spanish-speaking countries follow ISO 8601, the international standard that designates Monday as the first day of the week. This is standard across Europe and Latin America. The US Sunday-first calendar is unusual from a global perspective, rooted in biblical tradition and 20th-century commercial printing conventions. If you send a Google Calendar invite to a Spanish-speaking contact, the column headers may appear to shift by one day depending on their device settings.

Domingo comes from the Latin 'dies Dominicus', meaning 'the Lord's day'. It replaced the pagan 'dies Solis' (Sun's day) during the Christianisation of the Roman Empire. The Latin root 'dominus' (lord, master) also gives English the words dominion, domain, dominant, and domestic. English retained 'Sunday' from the Germanic sun-day tradition instead.

Sabado comes from the Hebrew word 'Shabbat' (the day of rest) via Latin 'sabbatum'. It replaced the pagan 'dies Saturni' (Saturn's day) during the early Christian period. French 'samedi', Italian 'sabato', and Portuguese 'sabado' share the same root. English kept 'Saturday' from Saturn instead. The English word 'Sabbath' and 'sabbatical' (a period of rest from work) come from the same Hebrew root.

Use 'el lunes' for a specific upcoming Monday: 'El lunes tengo cita' (I have an appointment on Monday). Use 'los lunes' for every Monday: 'Los lunes trabajo desde casa' (On Mondays I work from home). Do not use a preposition -- Spanish does not use 'en' before days the way Italian uses 'il'. The definite article (el/los) does the job of English 'on'.

The Spanish date format is: [day number] de [month] de [year]. Example: 17 de abril de 2026. The month is always lowercase. You can optionally add the day of the week: 'viernes, 17 de abril de 2026'. The numeric format is DD/MM/YYYY, not the US MM/DD/YYYY. Writing '4/7' to a Spanish contact means 4 July, not April 7.

Yes. All seven days of the week in Spanish are masculine. You say 'el lunes', 'los martes', 'un buen viernes'. Never 'la lunes' or 'las viernes'. Adjectives describing days must also be masculine: 'un sabado tranquilo' (a peaceful Saturday). This rule has no exceptions across any Spanish-speaking region.

Yes, the spelling is identical. Lunes is lunes everywhere in the Spanish-speaking world. Pronunciation differs slightly: Castilian Spanish has a stronger, more velar /x/ in 'jueves', and the /th/ sound (in words like 'cinco') does not appear in the day names themselves. Latin American Spanish uses a softer /x/. Both accents stress the same syllables and use the same articles. Use the dual-accent toggle on the homepage to hear both.

The fastest method is the planet-god mnemonic: five days are named after Roman gods you already know from English. Lunes = lunar (Moon), martes = martial (Mars), miercoles = mercurial (Mercury), jueves = jovial (Jupiter/Jove), viernes = venerate (Venus). Sabado = Sabbath (Hebrew day of rest), domingo = dominion (Lord's day). For learners, the classic children's song 'Los Dias de la Semana' cements the order in memory through melody.

The most effective strategies for heritage households: use Spanish days consistently at home (lunes = Monday in home conversations), play or sing 'Los Dias de la Semana' -- the widely known Spanish children's song fixes the days through melody. Print and display a bilingual chart (free from this site). For older children, the spaced-repetition flashcard trainer on this site practises the days with dual-accent audio and no signup required.