German Days, Months & Seasons (am, im & -tag)

You already know more German days than you think. Montag is Monday, Freitag is Friday — English and German share the same Germanic bones, so half the vocabulary is nearly free. The part that actually trips people up isn’t the words; it’s the tiny preposition in front of them. Say “in Montag” or “am Juli” and a native speaker winces instantly. So this guide isn’t a word list to memorize — it’s a sentence-builder. By the end you’ll be able to say something like Am Samstag fahre ich im Sommer nach Berlin and have every little word in the right place.

The seven days (and the -tag pattern)

German weeks start on Montag (Monday), not Sunday — worth knowing when you read a German calendar or timetable. Six of the seven days end in -tag (“day”), which is the same building block as English -day. The lone rebel is Mittwoch (Wednesday), literally Mitte + Woche, “mid-week.”

German	English	Hint
Montag	Monday	Mond = moon
Dienstag	Tuesday	not Donnerstag!
Mittwoch	Wednesday	“mid-week,” no -tag
Donnerstag	Thursday	Donner = thunder (Thor)
Freitag	Friday	mirrors Fri-day
Samstag	Saturday	Sonnabend up north
Sonntag	Sunday	Sonne = sun

Two things to lock in. First, every day is masculine — der Montag, der Mittwoch — even the one without -tag; if German genders feel slippery, the der/die/das gender guide is the place to firm them up. Second, days are nouns, so they’re always capitalized. That feels odd if you’re coming from French or Spanish, which lowercase them.

Saying “on a day”: always am

To say something happens on a particular day, use am plus the day. That’s it — no extra article.

German	English
Ich gehe am Samstag ins Kino.	I'm going to the cinema on Saturday.
Am Freitag habe ich frei.	I'm off on Friday.
Was machst du am Sonntag?	What are you doing on Sunday?

Here’s the secret most lists skip: am is itself a contraction of an dem (dative). The article is already baked in, so “am dem Montag” double-counts it — just say am Samstag. For a stretch of days, swap am for the frame von … bis: Ich arbeite von Montag bis Freitag (“I work from Monday to Friday”) — no am, no article.

The twelve months (and always im)

German months are near-identical Latin borrowings, so you can read them on sight. All are masculine and capitalized, just like the days.

German	English	Season
Januar	January	Winter
Februar	February	Winter
März	March	Frühling
April	April	Frühling
Mai	May	Frühling
Juni	June	Sommer
Juli	July	Sommer
August	August	Sommer
September	September	Herbst
Oktober	October	Herbst
November	November	Herbst
Dezember	December	Winter

For months, the preposition flips to im (= in dem, dative again): Im Juli fahre ich nach Deutschland, Im August habe ich Geburtstag, Die Schule beginnt im September.

The four seasons — also im

Good news: the seasons follow the exact same rule as months, because they’re all masculine too. One preposition, im, covers both.

German	English	Months
Frühling	spring	März–Mai
Sommer	summer	Juni–August
Herbst	autumn / fall	Sep–Nov
Winter	winter	Dez–Feb

So you get Im Sommer mache ich Urlaub (“In summer I go on holiday”) and Im Winter fahren wir nach Bayern. Want to describe the weather? Each season has an adjective: sommerlich (summery), herbstlich (autumnal), winterlich (wintry), frühlingshaft (spring-like) — perfect for small talk like Es ist herbstlich heute.

The one rule that ties it all together

If you remember nothing else, remember this line:

am for days · im for months and seasons · um for clock times.

am Montag · im Juli · im Sommer · um drei Uhr. All three are dative contractions, and together they let you build a full when-sentence: Am Samstag um drei Uhr (“on Saturday at three o’clock”). The clock half of that trio gets its own walkthrough in the telling time in German guide, which finishes off the um piece.

”Every Monday”: the lowercase -s form

To say you do something every Monday, drop the am, lowercase the day, and add -s. This is the one time a day appears in lowercase, because it’s now an adverb, not a noun.

German	English
Montags gehe ich schwimmen.	On Mondays I go swimming.
Ich arbeite sonntags nicht.	I don't work on Sundays.

Writing dates

A German date is an ordinal number, so it pairs with am: am ersten Mai (“on the first of May”), am dritten Juli (“on the third of July”). Written numerically, the ordinal takes a period — 1. Mai reads as der erste Mai. If the ordinals feel shaky, build them up first with the numbers 1–100 counting guide; dates are just ordinals plus am.

You now have more than a list — you have the machinery to slot any day, month, or season into a real sentence. Pick this week’s plans and say them out loud: Am Freitag… im Sommer…. Try writing your own birthday as Mein Geburtstag ist am … Mai, and the pattern will be yours for good.