Αν έχει λίγο αεράκι το βράδυ, θα ανοίξω πάλι την μπαλκονόπορτα.

Yes, έχει literally means has, but in Modern Greek it is also very commonly used in an impersonal way for weather and general conditions.

So έχει λίγο αεράκι means something like:

• there’s a little breeze
• it’s a bit breezy

This is the same pattern as:

• Έχει κρύο. = It’s cold.
• Έχει ζέστη. = It’s hot.
• Έχει αέρα. = It’s windy.
• Έχει κόσμο. = There are lots of people.

So here, έχει does not mean someone has a breeze. It is just the normal Greek way to describe the condition.

Because in Greek, after αν in a real future condition, you normally do not use θα.

This is the standard pattern:

• Αν + present
• θα + verb in the main clause

So:

• Αν έχει λίγο αεράκι..., θα ανοίξω...

This is basically the Greek equivalent of an English first conditional:

• If there is a little breeze..., I’ll open...

For an English speaker, the key thing to remember is:

• English: If it is / if there is..., I will...
• Greek: Αν έχει..., θα ανοίξω...

Using αν θα έχει in a sentence like this is generally not the normal choice.

Θα ανοίξω is the normal future form meaning I will open.

A very important Greek grammar point is that the future is formed with:

• θα
  • a verb form

Here, ανοίξω is the perfective non-past form of ανοίγω. In practical learner terms, that means it is the form used for a single complete action.

So:

• θα ανοίξω = I will open
• ανοίγω = I open / I am opening

Why not θα ανοίγω?

Because θα ανοίγω would usually suggest repeated, habitual, or ongoing action, something more like:

• I will be opening
• I will open regularly

But here the meaning is one simple action: opening the balcony door once. So θα ανοίξω is exactly right.

Αεράκι is a diminutive form related to αέρας.

• αέρας = air / wind
• αεράκι = little breeze / light breeze / bit of air

The ending -άκι often makes a noun smaller, milder, or more affectionate in tone.

So αεράκι suggests something gentle and pleasant, not strong wind. In this sentence, it gives the feeling of a slight breeze.

This kind of diminutive is very common and natural in Greek. It does not necessarily sound childish. It often just makes the meaning softer or more specific.

Λίγο here means a little.

It appears in the neuter singular form because αεράκι is a neuter singular noun.

Compare:

• λίγος αέρας = a little wind / little wind
• λίγη ζέστη = a little heat
• λίγο αεράκι = a little breeze

So the form changes to match the noun.

As for the article: Greek often does not use an indefinite article the way English uses a/an. So λίγο αεράκι is perfectly natural without anything corresponding to English a.

In other words, Greek does not need a separate word here to mean a little breeze.

Because Greek very often uses the definite article in time expressions.

So:

• το πρωί = in the morning
• το μεσημέρι = at noon / in the midday
• το απόγευμα = in the afternoon
• το βράδυ = in the evening / at night / tonight, depending on context

This is just the normal Greek way to express time.

Here το βράδυ functions adverbially, telling you when the condition applies. Depending on context, it could be understood as:

• in the evening
• at night
• tonight

Μπαλκονόπορτα is a compound noun meaning balcony door, often something like a patio door or glass door leading to a balcony.

It is a feminine noun, so as the direct object of ανοίξω, it appears in the accusative with the feminine article:

• την μπαλκονόπορτα

So:

• η μπαλκονόπορτα = the balcony door (subject form)
• την μπαλκονόπορτα = the balcony door (object form)

The final -ν in την is kept here because the next word begins with μπ, and keeping that -ν is standard.

A useful pronunciation note: at the beginning of a word, μπ is usually pronounced like b, so μπαλκονόπορτα starts roughly like bal-.

Here πάλι means again.

So θα ανοίξω πάλι την μπαλκονόπορτα means I’ll open the balcony door again.

Yes, Greek word order is more flexible than English, so πάλι can move around depending on emphasis. For example:

• Θα ανοίξω πάλι την μπαλκονόπορτα.
• Πάλι θα ανοίξω την μπαλκονόπορτα.

Both are possible, but the emphasis shifts slightly.

Also, Greek often uses the prefix ξανα- for again, so another very natural version would be:

• θα ξανανοίξω την μπαλκονόπορτα

That also means I’ll open the balcony door again.

In this sentence, though, πάλι is perfectly normal and clear.