No outono, eu costumo beber café quente e estudar à tarde.

No is a contraction of em + o.

• em = in
• o = the
• em o outono becomes no outono

So no outono literally means in the autumn.

In Portuguese, seasons are often used with the definite article:

• no outono = in the autumn
• no inverno = in the winter
• na primavera = in the spring
• no verão = in the summer

Using the article here sounds very natural in Brazilian Portuguese.

Costumo comes from the verb costumar, which means to usually do, to tend to do, or to be in the habit of doing.

So:

• eu costumo beber café quente = I usually drink hot coffee
• eu costumo estudar à tarde = I usually study in the afternoon

It is followed by an infinitive verb:

• costumar + infinitive

Examples:

• Costumo acordar cedo. = I usually wake up early.
• Ela costuma correr de manhã. = She usually runs in the morning.

Because after costumar, Portuguese normally uses another verb in the infinitive.

Pattern:

• costumar + infinitive

So in the sentence:

• costumo beber
• costumo estudar

This works just like English I usually drink / I usually study, although Portuguese expresses it with the verb costumar plus the infinitive.

Not always. Portuguese often drops subject pronouns when the verb already makes the subject clear.

• Eu costumo beber café quente...
• Costumo beber café quente...

Both are correct.

Because costumo clearly shows I from the verb ending, eu is optional. People may include eu for emphasis, clarity, or rhythm.

The comma separates the introductory time expression from the rest of the sentence.

• No outono, eu costumo beber café quente...

This is similar to English:

• In autumn, I usually drink hot coffee...

In Portuguese, this comma is common and natural when a time phrase comes first, though in some short sentences it may be omitted. Here, the comma helps readability.

In Portuguese, adjectives usually come after the noun.

• café quente = hot coffee
• casa grande = big house
• livro interessante = interesting book

So café quente is the normal order.

If an adjective comes before the noun, it can sometimes sound literary, emphatic, or change the nuance, but that is not the normal pattern here.

Quente is an adjective ending in -e, and many adjectives like this have the same form for masculine and feminine singular.

• café quente = hot coffee
• sopa quente = hot soup

For the plural, it changes:

• cafés quentes
• sopas quentes

So in this sentence, quente matches singular café, but its singular form stays quente.

À tarde means in the afternoon.

It is a very common time expression:

• de manhã = in the morning
• à tarde = in the afternoon
• à noite = at night / in the evening

So:

• estudar à tarde = to study in the afternoon

Because this is a crase, which happens when:

• the preposition a
• combines with the feminine article a

So:

• a + a = à

In à tarde, the expression historically includes that contraction, and the accent marks it.

This same thing appears in many common expressions:

• à noite = at night
• à esquerda = to the left
• à moda brasileira = in the Brazilian style

For learners, it is often easiest at first to memorize à tarde and à noite as fixed expressions.

Yes, in Brazil de tarde is also very common in everyday speech.

• estudar à tarde
• estudar de tarde

Both can mean to study in the afternoon.

In many teaching materials, à tarde is presented as the standard form, but de tarde is very natural in spoken Brazilian Portuguese.

Yes. In this sentence, costumo governs both infinitives:

• beber café quente
• estudar à tarde

So the meaning is:

• I usually drink hot coffee and study in the afternoon.

Portuguese often uses one conjugated verb with two infinitives joined by e (and).

Beber café is correct and completely understandable. However, in Brazilian Portuguese, tomar café is often more idiomatic for to drink coffee.

So you may hear:

• Costumo tomar café quente...

Both are correct:

• beber café = literally drink coffee
• tomar café = very common, natural way to say drink coffee

Be careful, though: tomar café can also sometimes mean to have breakfast, depending on context, especially in expressions like tomar café da manhã.

It is the first person singular of costumar in the present tense.

Present tense:

• eu costumo = I usually
• você/ele/ela costuma = you/he/she usually
• nós costumamos = we usually
• vocês/eles/elas costumam = you/they usually

Examples:

• Eu costumo ler à noite.
• Ela costuma viajar em julho.
• Nós costumamos cozinhar juntos.

Yes, Portuguese allows some flexibility.

Original:

• No outono, eu costumo beber café quente e estudar à tarde.

Other possible versions:

• Eu costumo beber café quente e estudar à tarde no outono.
• Costumo beber café quente e estudar à tarde no outono.

The original sentence sounds very natural because it puts the seasonal time frame first: No outono.

Without costumo, the meaning changes slightly.

• No outono, eu bebo café quente e estudo à tarde.

This can still mean something habitual depending on context, but costumo makes the sense of usually / habitually more explicit.

So:

• eu bebo = I drink / I do drink
• eu costumo beber = I usually drink

Yes, outono is the normal word for autumn/fall.

That said, in everyday conversation, especially in some parts of Brazil, people may talk less about seasons than English speakers from countries with stronger seasonal differences. But the word itself is completely standard:

• No outono faz mais frio. = In autumn it gets colder.
• As folhas caem no outono. = Leaves fall in autumn.

In Brazil, outono is generally more common than trying to translate fall literally.