Ask any Spanish learner what they wish they’d memorized in week one, and the days of the week land near the top of the list. They show up everywhere: when you book a class, confirm a dinner, read a bus timetable, or simply answer the question “¿qué día es hoy?” Yet the seven Spanish weekdays come with a few quirks that trip people up, from why they’re never capitalized to why lunes seems to mean both “Monday” and “Mondays” at the same time.

This guide walks you through all seven days with clear pronunciation, the small grammar rules that actually matter, the time vocabulary that surrounds them, and a handful of memory tricks that make the whole set stick. By the end you’ll be able to talk about your week in Spanish without hesitating.

The Seven Days of the Week in Spanish

Spanish has seven weekday names, just like English, but the order traditionally starts on Monday (lunes) rather than Sunday. Five of them end in -es, which is one of the reasons they’re easy to confuse early on. Here’s the full set with a simple phonetic guide.

A quick pronunciation note: the Spanish j in jueves is a breathy “h” sound made in the back of the throat, not the soft English “j.” And the v in viernes is pronounced almost like a soft “b,” which is why native speakers can sound like they’re saying “bee-AIR-ness.” Lean into those and you’ll sound far more natural. If days of the week happen to be one of your first vocabulary sets, it’s worth comparing them with the days of the week in English to see how differently the two languages handle stress and spelling.

Why Spanish Days Are Lowercase and Masculine

Two grammar points surprise almost every beginner, and getting them right instantly makes your writing look more polished.

They’re written in lowercase

In English we always capitalize Monday, Tuesday, and so on. Spanish does the opposite: weekday names are common nouns, so they stay lowercase unless they begin a sentence or appear in a title. You’d write “Nos vemos el viernes” (See you on Friday), with a small v. The same rule applies to months, by the way, so once you internalize it for days you’ve solved both.

They’re all grammatically masculine

Every Spanish day is masculine, which means it takes el in the singular and los in the plural: el lunes, los lunes. You never say “la martes.” This matters because Spanish nouns drive the rest of the sentence through gender agreement, a habit you’ll also rely on when working through tricky verb pairs like ser vs. estar. Treat the day’s gender as fixed and you’ll never second-guess the article.

How to Use El and Los With Days

This is where the days become genuinely useful, because the article you choose changes the meaning entirely.

• el + day = one specific upcoming or past day. El lunes tengo cita con el médico. (On Monday I have a doctor’s appointment.)
• los + day = something that happens every week on that day. Los lunes voy al gimnasio. (On Mondays I go to the gym.)
• No preposition needed: Spanish does not use a separate word for “on.” The article does that job, so “on Friday” is simply el viernes, never “en viernes.”

For Saturday and Sunday, the plural is regular because they don’t already end in -s: los sábados, los domingos. The five -es days stay identical in singular and plural, so only the article tells you which one is meant. Compare el martes (this Tuesday) with los martes (every Tuesday) and you’ll feel the difference.

Where the Spanish Day Names Come From

The weekday names carry thousands of years of history, and knowing the stories behind them makes each one far easier to remember. Five days trace back to Roman gods and the planets named after them.

• lunes — from Latin Lunae dies, “day of the Moon” (luna still means moon).
• martes — from Martis dies, the day of Mars, the god of war.
• miércoles — from Mercurii dies, the day of Mercury, messenger of the gods.
• jueves — from Iovis dies, the day of Jupiter (Jove), king of the gods.
• viernes — from Veneris dies, the day of Venus, goddess of love.

The weekend pair has different roots. Sábado comes from the Hebrew Shabbat, the Sabbath day of rest, and domingo comes from the Latin dominicus, “the Lord’s day.” If you’ve ever studied another Romance language, you’ll notice the family resemblance: the same planetary logic shapes the days of the week in Portuguese, even though Portuguese took its own unusual path with numbered weekdays.

Time Words That Go Hand in Hand With the Days

You rarely use a weekday in isolation. To talk naturally about your schedule, pair it with the surrounding time vocabulary.

• hoy (OY) — today
• mañana (mah-NYAH-nah) — tomorrow (it also means “morning”)
• ayer (ah-YAIR) — yesterday
• anteayer (an-teh-ah-YAIR) — the day before yesterday
• pasado mañana — the day after tomorrow
• la semana — the week
• el fin de semana — the weekend
• entre semana — on weekdays / during the week
• el día — the day
• diario / semanal — daily / weekly

Put them together and your sentences sound effortless: Hoy es jueves, mañana es viernes y pasado mañana empieza el fin de semana. (Today is Thursday, tomorrow is Friday, and the day after tomorrow the weekend begins.) A handy structure to know is “de lunes a viernes” (Monday to Friday), perfect for describing work or class schedules.

Memory Tips to Lock In the Days

Memorizing seven words is easier when you attach them to something. Try a few of these approaches and keep whatever clicks.

• Group the -es endings. Five days (lunes, martes, miércoles, jueves, viernes) share the same ending. Learn them as a rhythmic chant and the weekday block almost sings itself.
• Anchor them to the planets. Mars (martes), Mercury (miércoles), Jupiter (jueves), Venus (viernes) line up neatly with English’s own god-based days, so you only need to link the sounds.
• Use cognates. Luna = moon helps with lunes, and domingo echoes “dominical.” Small bridges like these reduce the raw memorizing.
• Label your real week. Stick the Spanish day on your phone calendar or planner so you read it in context every single morning.
• Speak, don’t just read. Saying “hoy es…” out loud each day builds the recall you actually need in conversation. The same active-practice principle pays off across the language, including when you tackle the quirks of conjugating gustar.

Common Mistakes to Avoid

A few errors come up again and again, and they’re all easy to fix once you’re aware of them.

• Capitalizing the days. Old English habits die hard, but in Spanish it’s lunes, not Lunes, mid-sentence.
• Dropping the accents. Only miércoles and sábado carry a written accent, and it marks where the stress falls. Leaving it off changes the spelling, not just the look.
• Adding “en” for “on.” The article already means “on,” so it’s el domingo, never “en domingo.”
• Mixing up el and los. Remember: el for one specific day, los for a repeating routine.

Frequently Asked Questions

Are the days of the week capitalized in Spanish?

No. Unlike English, Spanish treats weekday names as ordinary nouns, so they stay lowercase unless they start a sentence or a title. The same goes for the months of the year.

Why is every day of the week masculine?

The Spanish day names descend from Latin masculine nouns (the word día, day, is itself masculine despite ending in -a). That’s why they all take el and los, and you never use la with a day.

What’s the difference between “el lunes” and “los lunes”?

El lunes refers to one specific Monday, usually the next or most recent one. Los lunes means “on Mondays” in the habitual sense, describing something you do every week.

Which Spanish days have accent marks?

Only two: miércoles and sábado. The accent shows the stressed syllable and is part of the correct spelling, so don’t leave it out.

How do I say “from Monday to Friday” in Spanish?

Use the phrase de lunes a viernes. It’s the standard way to describe a work or school week, and you’ll hear it constantly in everyday conversation.