A interrupção programada termina amanhã de manhã.

A is the feminine singular definite article, meaning the.

It is used because interrupção is a feminine singular noun:

• a interrupção = the interruption

In Portuguese, nouns normally need an article more often than in English, especially in ordinary statements like this one.

Literally, it means programmed interruption or scheduled interruption.

In natural English, depending on context, it may be translated as:

• scheduled outage
• planned interruption
• scheduled shutdown

Here:

• interrupção = interruption, outage
• programada = programmed, planned, scheduled

Because adjectives in Portuguese usually agree in gender and number with the noun they describe.

Since interrupção is:

• feminine
• singular

the adjective must also be:

• feminine
• singular

So:

• interrupção programada

Compare:

• o serviço programado = the scheduled service
• a interrupção programada = the scheduled interruption

Yes, programada is very natural, especially in technical, utility, IT, maintenance, or service-announcement contexts.

You could also see:

• interrupção planejada
• interrupção prevista

But programada often sounds especially appropriate when something has been officially scheduled in advance.

Termina is the present tense of terminar, but in Portuguese the present tense is often used to talk about a near or scheduled future.

So:

• termina amanhã de manhã literally looks like ends tomorrow morning
• but naturally means will end tomorrow morning

This is very common in both Portuguese and English for scheduled events:

• The train leaves at 8
• A interrupção termina amanhã de manhã

You could say terminará, but it sounds a bit more formal or more explicitly future-oriented.

Termina is the third person singular form of terminar in the present indicative.

Conjugation:

• eu termino
• você/ele/ela termina
• nós terminamos
• vocês/eles/elas terminam

In this sentence, the subject is A interrupção programada, which is singular, so the verb is termina.

Portuguese often does not need a separate word like will when the time expression already makes the future clear.

Here, amanhã de manhã clearly shows the action happens in the future:

• amanhã = tomorrow
• de manhã = in the morning

So termina is enough.

Portuguese can express the future in several ways:

• termina amanhã = ends / will end tomorrow
• vai terminar amanhã = is going to end tomorrow
• terminará amanhã = will end tomorrow

All are possible, but the present tense is very common for schedules and planned events.

It means tomorrow morning.

It is made of:

• amanhã = tomorrow
• de manhã = in the morning

Together:

• amanhã de manhã = tomorrow morning

This is a very common expression in Brazilian Portuguese.

In Portuguese, time-of-day expressions usually use a preposition:

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

So Portuguese says:

• amanhã de manhã literally something like
• tomorrow in the morning

You normally would not say just amanhã manhã.

By itself, de manhã only means in the morning.

Examples:

• Eu trabalho de manhã. = I work in the morning.

When you add amanhã, it becomes:

• amanhã de manhã = tomorrow morning

So the full expression gives the specific time reference.

The order is very normal in Portuguese:

• A interrupção programada = subject
• termina = verb
• amanhã de manhã = time expression

So it follows a basic pattern:

• Subject + Verb + Time

This is the most neutral and natural word order.

Yes. That is completely correct and very natural.

It uses ir + infinitive, a common future construction:

• vai terminar = is going to end / will end

Comparison:

• A interrupção programada termina amanhã de manhã.
  More concise; very common for schedules.
• A interrupção programada vai terminar amanhã de manhã.
  Also natural; slightly more explicit about future.

Usually no, not in a normal full sentence like this.

In Portuguese, the article is generally expected:

• A interrupção programada termina amanhã de manhã.

Without A, it sounds unnatural in ordinary usage, unless it is a headline, label, or note-style text.

For example, in a headline you might see something shorter:

• Interrupção programada termina amanhã de manhã

But as a regular sentence, A is the normal choice.

A rough pronunciation guide is:

• interrupção ≈ een-teh-hoop-SOWN in Brazilian Portuguese

A few important things to notice:

• The ending -ção is very common in Portuguese and usually sounds like são with a nasal vowel.
• The r in the middle of a Brazilian word is often softer than English r, and can sound somewhat like h in many accents.
• The stress is on the last syllable: -ção

Words ending in -ção are extremely common:

• interrupção
• informação
• situação

Not always, but it is very common and often correct.

Depending on context, Portuguese might also use:

• queda de energia = power outage / loss of power
• corte de energia = power cut
• parada = stoppage
• suspensão = suspension

But interrupção programada is a very normal phrase in formal notices about service, electricity, internet, water, or maintenance.

Yes. Interrupção programada is broad and can refer to many kinds of planned service interruptions, such as:

• electricity
• water
• internet
• maintenance operations
• system downtime

The exact meaning depends on context. On its own, the sentence does not specify what is being interrupted.

It sounds neutral to formal.

It would fit very well in:

• service announcements
• maintenance notices
• utility messages
• customer communications

It is not slangy or conversational, but it is also not overly stiff. It is standard, clear Brazilian Portuguese.