Από τον Σεπτέμβριο η ανιψιά μου θα πάει στο νηπιαγωγείο της γειτονιάς.

Here it means from September onward, or more naturally in English, starting in September / as of September.

So the idea is not just one moment in September, but a change that begins then: from that time on, the niece will go to kindergarten.

Because από is followed here by the accusative case in a time expression.

The base form is ο Σεπτέμβριος
In the accusative singular, it becomes τον Σεπτέμβριο

So:

• ο Σεπτέμβριος = September
• τον Σεπτέμβριο = September, as the object of the preposition από

In Greek, months very often appear with the definite article, especially in expressions like this.

So Greek naturally says:

• τον Σεπτέμβριο = in September / this September
• από τον Σεπτέμβριο = from September

This is normal Greek usage, even though English usually says just September without the.

Greek usually uses the definite article with nouns much more often than English does.

So η ανιψιά μου is the normal way to say my niece.

Compare:

• η αδερφή μου = my sister
• το σπίτι μου = my house
• ο φίλος μου = my friend

In English, the possessive my replaces the, but in Greek the article normally stays.

Because possessive words like μου usually come after the noun in Greek.

So:

• η ανιψιά μου = my niece
• το βιβλίο μου = my book
• ο πατέρας μου = my father

This is one of the big differences from English word order.

Ανιψιά means niece.

The masculine form is:

• ανιψιός = nephew

So in this sentence, because it says η ανιψιά μου, it specifically means my niece.

Θα πάει is the future form: will go.

• θα is the future particle
• πάει is the verb form used here with it

So:

• πάει by itself can have other uses depending on context
• θα πάει clearly means she will go

In this sentence, it can also naturally imply she will start going / she will attend kindergarten from September.

This is a very common learner question.

Greek often uses πάω / πηγαίνω as two related ways of expressing go. In the future, θα πάει is very natural and standard.

Very roughly:

• πάει here is the form used after θα
• πηγαίνει is a present/imperfective form, more like she goes / she is going

In this sentence, θα πάει presents the action as a future whole event. With a school context, it often sounds like she’ll go / start attending.

Στο is a contraction of:

• σε + το = στο

So:

• σε = to / in / at
• το = the

Together:

• στο νηπιαγωγείο = to the kindergarten

This kind of contraction is very common in Greek:

• στο = σε + το
• στη = σε + τη(ν)
• στον = σε + τον

Νηπιαγωγείο means kindergarten.

It is a neuter noun, which is why it takes το:

• το νηπιαγωγείο = the kindergarten

So after σε + το, you get:

• στο νηπιαγωγείο

Literally, it means of the neighborhood.

This is the genitive case:

• η γειτονιά = the neighborhood
• της γειτονιάς = of the neighborhood

So:

• το νηπιαγωγείο της γειτονιάς = the neighborhood’s kindergarten
• more naturally in English: the neighborhood kindergarten or the kindergarten in the neighborhood

Greek uses the genitive very often where English might use of or a noun used like an adjective.

No, Greek word order is fairly flexible.

This sentence begins with Από τον Σεπτέμβριο to highlight the time: starting in September.

A more neutral order could be:

Η ανιψιά μου θα πάει στο νηπιαγωγείο της γειτονιάς από τον Σεπτέμβριο.

Both are grammatical, but putting the time phrase first gives it more emphasis.

Yes. In standard modern Greek, month names are often written with a lowercase letter unless they start the sentence or a particular style chooses capitalization.

So you may see both:

• τον Σεπτέμβριο
• τον σεπτέμβριο in less formal or style-dependent contexts

In careful standard writing, lowercase is very common for months, but capitalization is also often seen in teaching materials, signs, forms, or stylistic writing.