Αν έχει ήλιο τον Μάιο, η συνάδελφός μου θα έρθει με κοντομάνικη μπλούζα και φούστα.

In this kind of Greek conditional sentence, αν normally takes a present-tense verb, not θα.

So Greek says:

• Αν έχει ήλιο, θα έρθει...

Literally this is more like:

• If it is sunny, she will come...

This is the normal pattern for a real or likely future condition:

• αν + present
• θα + verb in the result clause

So Αν θα έχει ήλιο is not standard here.

Έχει ήλιο is a very common Greek weather expression. Literally it means it has sun, but idiomatically it means it is sunny.

Greek often uses έχει with weather and general conditions:

• έχει κρύο = it is cold
• έχει ζέστη = it is hot
• έχει αέρα = it is windy
• έχει ήλιο = it is sunny

So even though it sounds unusual from an English point of view, it is completely natural Greek.

In Greek, months are very often used with the definite article, especially in time expressions like in May.

So:

• τον Μάιο = in May

The article is part of a very common pattern:

• τον Ιανουάριο
• τον Απρίλιο
• τον Μάιο

Also, this is in the accusative case, because Greek often uses the accusative for expressions of time when something happens.

Greek often expresses time without a preposition where English uses in.

So English says:

• in May

Greek simply says:

• τον Μάιο

This is normal. Greek time expressions often work this way.

Greek usually keeps the definite article with possessives like μου, σου, του, της.

So Greek normally says:

• η φίλη μου = my friend
• το σπίτι μου = my house
• η συνάδελφός μου = my colleague

Even though English does not use the with my, Greek usually does use the article here. So η συνάδελφός μου is the normal structure.

This happens because μου is an enclitic, a little unstressed word that leans on the word before it.

The noun συνάδελφος is stressed early in the word, and when an enclitic like μου follows, Greek spelling often adds an extra written accent:

• συνάδελφος
• η συνάδελφός μου

You will see the same thing in examples like:

• ο άνθρωπός μου

So this is a regular spelling pattern, not a different word.

Συνάδελφος is a common-gender noun. That means the same noun form can refer to either a man or a woman.

The article shows the gender here:

• ο συνάδελφος = the male colleague
• η συνάδελφος = the female colleague

In your sentence, η tells you it is feminine: my female colleague.

So yes, even though -ος often looks masculine, some nouns with -ος can be feminine too.

The verb έρχομαι is irregular. Its future and aorist use a different stem: έρθ-.

That is why you get forms like:

• έρχομαι = I come / I am coming
• θα έρθω = I will come
• θα έρθει = he/she will come

This is very common with this verb, so it is worth memorizing as a pattern.

Θα έρθει uses the perfective future, which is the normal choice for a single complete event:

• she will come

That fits this sentence, because it refers to one future occasion.

Θα έρχεται would suggest something habitual, repeated, or more ongoing, depending on context. That is not what this sentence is aiming for.

So θα έρθει is the natural form here.

Here με means something like with, but in natural English the idea is often wearing or dressed in.

So:

• θα έρθει με κοντομάνικη μπλούζα και φούστα

means she will come:

• wearing a short-sleeved blouse and a skirt

This use of με is very common with clothing and appearance:

• ήρθε με παλτό = he came wearing a coat
• ήρθε με μαύρα = she came dressed in black

After με, Greek often uses bare nouns when talking about what someone is wearing, especially when the meaning is general or descriptive.

So:

• με κοντομάνικη μπλούζα και φούστα

means something like:

• in a short-sleeved blouse and a skirt
• wearing a short-sleeved blouse and a skirt

Greek does not need an article here to sound natural.

You could add μια if you wanted a more explicitly indefinite meaning:

• με μια κοντομάνικη μπλούζα και μια φούστα

But the version without μια is very normal.

After με, Greek uses the accusative case.

So both clothing nouns are accusative here.

The tricky part is that for these feminine singular nouns, the nominative and accusative look the same:

• η μπλούζα → τη μπλούζα
• η φούστα → τη φούστα

Because the form does not change much, English speakers may not notice the case at first. But grammatically, they are accusative after με.

No. Grammatically, κοντομάνικη modifies only μπλούζα.

So the sentence means:

• a short-sleeved blouse
• and a skirt

It does not mean the skirt is short-sleeved, of course.

If Greek wanted to describe both nouns with separate adjectives, it would normally say both:

• με κοντομάνικη μπλούζα και μακριά φούστα

The adjective agrees with the noun in gender, number, and case.

Here:

• μπλούζα is feminine singular
• so the adjective is also feminine singular: κοντομάνικη

This is standard Greek adjective agreement.

The basic adjective is:

• masculine: κοντομάνικος
• feminine: κοντομάνικη
• neuter: κοντομάνικο

So κοντομάνικη μπλούζα is a normal feminine-singular noun phrase.