Days, Months, and Seasons in Spanish: The Complete Guide

You text a friend in Lima to lock in a plan: "¿Nos vemos el Lunes?" — capital L, just like you'd write it in English. She writes back without correcting you, but if you'd shown that message to a Spanish teacher, they'd have circled that capital letter immediately. Days of the week, months, and seasons are some of the first words any Spanish learner picks up, and they're also one of the most reliable places English habits sneak into your Spanish without you noticing.

That capitalization habit isn't just a cosmetic slip — it's a small, constant tell that your Spanish is still running on English rules underneath. Days, months, and seasons come up in nearly everything: scheduling plans, filling out a form, talking about the weather, telling someone your birthday. Once you know the handful of real differences — no capital letters, a different word order for writing dates, and even which day starts the week — this whole category of vocabulary stops being a source of small, repeated mistakes and starts working exactly the way native speakers expect.

The days of the week in Spanish are "lunes" (LOO-nehs, Monday), "martes" (MAR-tehs, Tuesday), "miércoles" (MYEHR-koh-lehs, Wednesday), "jueves" (HWEH-vehs, Thursday), "viernes" (VYEHR-nehs, Friday), "sábado" (SAH-bah-doh, Saturday), and "domingo" (doh-MEEN-goh, Sunday). None of them is capitalized in normal writing, unlike English, where Monday and Tuesday always take a capital letter — in Spanish, "lunes" only gets capitalized at the very start of a sentence, the same as any other ordinary noun. A second real difference, and one that surprises a lot of learners: the Spanish week starts on Monday, not Sunday. Calendars printed in Spain and Latin America list "lunes" as the first column, which matters if you're ever reading a printed schedule or calendar app set to a Spanish locale and trying to figure out why the days look shifted from what you're used to.

Saying "on" a particular day uses the definite article instead of a separate preposition — Spanish doesn't have a direct word-for-word match for English "on." "El lunes tengo una reunión" means "On Monday I have a meeting," with "el" doing the job English hands to "on." For a repeated, habitual day, the article simply goes plural: "los lunes" means "on Mondays," as in every Monday — "Los lunes voy al gimnasio" (I go to the gym on Mondays). Here's the one irregular corner worth flagging: "lunes" through "viernes" don't change form in the plural at all, since they already end in an unstressed -s ("los lunes," "los martes," "los jueves"), but "sábado" and "domingo" do take a normal plural -s: "los sábados," "los domingos."

The months follow the same no-capital-letters rule and are, in most cases, close enough to their English counterparts to recognize at a glance: "enero" (January), "febrero" (February), "marzo" (March), "abril" (April), "mayo" (May), "junio" (June), "julio" (July), "agosto" (August), "septiembre" (September, sometimes spelled "setiembre" in some regions), "octubre" (October), "noviembre" (November), and "diciembre" (December). Unlike days, months in Spanish don't usually take an article at all when you're just naming one: "Mi cumpleaños es en abril" (My birthday is in April) uses "en," not "el," and drops the article entirely. That's a small but real difference from the day-of-week pattern above, and mixing the two up is an easy, common slip.

The four seasons are "la primavera" (lah pree-mah-VEH-rah, spring), "el verano" (el veh-RAH-noh, summer), "el otoño" (el oh-TOH-nyoh, fall/autumn), and "el invierno" (el een-VYEHR-noh, winter). Notice that seasons, unlike days and months, do take a gendered article when you're talking about them generally — "primavera" is feminine, the other three are masculine — though the article often drops in short phrases like "en verano" (in summer), similar to how months drop theirs. [AUDIO: primavera] [AUDIO: invierno]

Writing a full date is where English speakers most often stumble, because Spanish flips the order English uses. Spanish writes and says a date as day, then month, then year, connected by "de": "el 25 de diciembre de 2026" (December 25th, 2026) is literally "the 25 of December of 2026," with no month-first shuffling the way an American date like "12/25/2026" would suggest. Cardinal numbers do the work here, not ordinals — you say "el dos de mayo" (the two of May), not a Spanish equivalent of "the second of May," with exactly one exception: the first of the month is commonly "el primero de" (the first of), as in "el primero de enero" (January 1st), though "el uno de enero" is also heard and understood, especially outside of formal writing. To ask what day or date it is, Spanish has two related but distinct questions: "¿Qué día es hoy?" (what day is it today — asking for the day of the week) versus "¿Cuál es la fecha de hoy?" or the very common "¿A cómo estamos?" (what's the date today — asking for the actual date).

A cultural note worth knowing, especially if you're learning Latin American Spanish: the seasons flip entirely below the equator. In Argentina, Chile, and Uruguay, "verano" runs from December through February and "invierno" runs from June through August — the exact opposite of the Northern Hemisphere calendar most English-language teaching materials assume. That means "Navidad" (Christmas) falls in the middle of summer in Buenos Aires, with beach trips and grilled asado as common holiday traditions rather than snow, which can genuinely surprise a learner using materials written with a Spain or Mexico frame of reference in mind.

Picture yourself making weekend plans with a friend in Bogotá. You'd confirm the day first, careful not to capitalize it in a text: "¿Nos vemos el sábado?" (Shall we meet on Saturday?). If they ask for your birthday, you'd answer with the day-month order baked in: "Mi cumpleaños es el catorce de marzo" (My birthday is March 14th) — never "marzo catorce." And if the conversation turns to travel plans, you might mention the season directly: "Voy a Buenos Aires en invierno, así que allá será verano" (I'm going to Buenos Aires in winter, so it'll be summer there) — a sentence that only makes sense once you know the hemisphere flip above.

Try it yourself. Fill in the blank with the correct article: "___ lunes tengo clase de español." Fill in the blank: "Mi cumpleaños es ___ noviembre." (using en or el) Translate to Spanish, day-month-year order: "The meeting is on July 3rd, 2026." Multiple choice: which season is summer in Buenos Aires in January — "verano" or "invierno"? Translate to Spanish: "I go to the market on Saturdays" (habitual). Multiple choice: which is correctly capitalized in the middle of a Spanish sentence — "el Martes" or "el martes"?

Answer key: "El lunes tengo clase de español" (the definite article marks "on" a specific day). "Mi cumpleaños es en noviembre" (months take "en," not "el," when just naming the month). "La reunión es el tres de julio de 2026" (day, then month, then year, cardinal number, no capitals). "Verano" — Buenos Aires is in the Southern Hemisphere, so January falls in summer. "Voy al mercado los sábados" (plural article for a repeated day). "El martes" is correct — Spanish never capitalizes day names mid-sentence.

Three things to carry forward: days and months are never capitalized in Spanish, even though English capitalizes both automatically, and the Spanish week runs Monday to Sunday rather than Sunday to Saturday. Dates are written and spoken day-then-month-then-year with cardinal numbers, not the month-first order English speakers default to. And if you're talking seasons with anyone south of the equator, remember the calendar flips entirely — verano means something very different in Buenos Aires than it does in Madrid. Ready to make these automatic? Try a round of Exercises to drill days, months, and dates in context, or browse Vocabulary for more everyday building blocks like this one.