The Spanish days of the week are wonderfully regular once you know a handful of Spanish sound rules. The challenge for English speakers is not the words themselves but three sounds that English reads incorrectly: the letter J, which is a guttural H in jueves; the letter V, which sounds like a B in viernes; and the “ie” combination, which is a single gliding diphthong in miércoles and viernes. Master those and all seven days fall into place. This guide breaks down lunes through domingo with IPA, stress, and exact mouth mechanics, so that by the end you can run through the whole Spanish week with a clean, confident accent.
Here are all seven days with IPA, a plain-English phonetic guide, and their origin. Note that Spanish does not capitalize the days:
A useful detail: lunes and martes look like plurals but are not - the -es is simply part of the word, and the same form covers both “Monday” and “on Mondays.” Five of the seven days come from Roman planets; sábado and domingo come from religion.
Three sounds carry almost all the difficulty. Master these and every day name becomes predictable:
Spanish vowels are pure and short - a, e, i, o, u never glide the way English vowels do. Keep them crisp and the words snap into focus.
Like French and English, the Spanish week descends from the Roman planetary calendar. Each weekday was originally “[planet] dies,” the day of that planet, and Spanish kept the planet names for five of the seven days. Lunes is the Moon (Luna), martes is Mars, miércoles is Mercury, jueves is Jupiter (Jove), and viernes is Venus. Trace any of them back and you find the same Latin god-planet that English honors with a Norse name on the very same day. In other words, you already know the meaning of five of these words - you are only learning new sounds for ideas you carry every week.
This is why martes (Mars) lines up with Tuesday (named for Tiw, the Germanic Mars) and viernes (Venus) lines up with Friday (named for Frigg, the Germanic Venus). Spanish preserved the Roman names directly; English translated them into Norse mythology. Both calendars are branches of the same ancient seven-day planetary tradition, which is why the weekday order matches exactly across the two languages.
The last two days broke from astronomy and turned to religion. Sábado comes from the Latin sabbatum, the “Sabbath,” the day of rest - the same root as the English word “Sabbath.” Domingo comes from dies dominicus, “the Lord's day,” reflecting the Christian re-naming of the first day of the week. Remembering this split is the easiest way to keep the system straight: five planet-days, then the Sabbath and the Lord's day to close the week.
English has no /x/ sound, so learners default to the soft English J or a plain “h.” The Spanish J is rougher and further back - a controlled rasp at the soft palate. Practice the “ch” of “loch” on its own, then attach “weh-bes” to make jueves.
Because English keeps V and B firmly separate, English speakers instinctively put their teeth on their lip for the V in viernes. In Spanish that is wrong: the V at the start of a word is a full B. Press both lips together and the word becomes correct instantly.
Both sounds show up in the most-searched day names, so fixing them pays off across the whole week.
These are the errors English speakers make most often:
Because Spanish and English share the Roman planetary week, you can anchor the Spanish days to the English ones you already know. Lunes is Monday, the Moon. Martes is Tuesday, the day of Mars. Miércoles is Wednesday, the day of Mercury. Jueves is Thursday, the day of Jupiter. Viernes is Friday, the day of Venus. Five of the seven map planet-for-planet onto the English week, so you only have to attach the right Spanish sounds to meanings you already carry.
For the last two, lean on meaning again: sábado is the Sabbath and domingo is the Lord's day. Saying the planet or meaning to yourself as you practice - “Mars, martes; Mercury, miércoles” - turns seven unfamiliar words into seven predictable labels. It also fixes the stress, because once the word feels familiar you naturally land the emphasis where it belongs: on the first syllable for every day except domingo.
The seven day names are identical everywhere Spanish is spoken, but a few sounds shift by region, and none of them will stop you being understood. The guttural J in jueves is strong and raspy in Spain, where it can sound almost like clearing the throat, while in much of Latin America and the Caribbean it softens toward a plain English “h.” Both are correct - “HWEH-bes” works whether the H is heavy or light.
The S in the plural-looking endings of lunes, martes and viernes is another small variable. In northern Spain and most of Latin America it is a clear “s,” but in southern Spain, the Caribbean and coastal regions it is often softened or dropped, so martes can sound like “MAR-teh.” Again, this is an accent feature, not an error. For a learner, the safest target is a clean, fully pronounced S, which is understood everywhere.
The one constant worth holding onto is the vowels. Across every Spanish accent, the five vowels stay pure and short - the “a” in sábado is always a clean “ah,” and the “o” in domingo is always a clean “oh,” never the drawn-out, gliding vowels of English. If you keep your vowels crisp and your stress in the right place, your days of the week will sound natural in Madrid, Mexico City or Bogotá alike.
The seven days are lunes (Monday), martes (Tuesday), miércoles (Wednesday), jueves (Thursday), viernes (Friday), sábado (Saturday), and domingo (Sunday). Five are named after Roman planets and two after religious days of rest. Note that Spanish does not capitalize the days of the week.
The J in jueves is the guttural /x/ sound - a raspy H made at the back of the mouth, like the “ch” in the Scottish “loch.” It is never the English J of “jump.” So jueves sounds like “HWEH-bes,” starting with that breathy rasp.
In Spanish, the letters B and V are pronounced the same, and at the start of a word both are a full /b/. So viernes begins exactly like the English word “bee,” giving “bee-AIR-nes.” There is no English-style V with the teeth on the lip.
Six of the seven days are stressed on the first syllable: LU-nes, MAR-tes, MIÉR-co-les, JUE-ves, VIER-nes, and SÁ-ba-do. The exception is domingo, which is stressed on the second syllable: do-MIN-go. The written accents on miércoles and sábado mark that first-syllable stress.
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