Hırkanı unutma; akşam rüzgâr çıkarsa dolmuş beklerken üşüyebilirsin.

Because hırkanı contains two extra pieces:

• hırka = cardigan
• hırkan = your cardigan
• hırkanı = your cardigan (as a specific direct object)

So the word is:

hırka + -n + -ı

Here:

• -n marks your
• -ı is the accusative ending, used because this is a specific thing: your cardigan

So Hırkanı unutma is literally something like Don’t forget your cardigan.

Unutma is the negative imperative of unutmak (to forget).

• unut- = forget
• unut = forget!
• unutma = don’t forget!

So this is a command or reminder addressed to you.

If you were speaking to more than one person, or more politely, you would often say unutmayın.

It is not stated explicitly, because Turkish often drops subject pronouns when the meaning is clear.

In this sentence, you is understood from the forms:

• hırkanı = your cardigan
• unutma = don’t forget (addressed to you)
• üşüyebilirsin = you may get cold

So the full sense is:

(Sen) hırkanı unutma; ... üşüyebilirsin.

But sen is unnecessary unless you want emphasis.

Here akşam means in the evening / tonight / this evening, depending on context.

Turkish often uses time words by themselves as adverbs, without a preposition like English in, on, or at.

So:

• akşam = in the evening / tonight
• yarın = tomorrow
• sabah = in the morning / morning
• pazartesi = on Monday

That is why akşam can stand alone naturally.

Because rüzgâr çıkmak is an idiomatic Turkish expression.

Literally:

• rüzgâr = wind
• çıkmak = to go out, come out, arise

But together, rüzgâr çıkmak means:

• the wind starts blowing
• the wind gets up
• the wind picks up

So akşam rüzgâr çıkarsa means if the wind picks up in the evening.

The ending -sa / -se is the conditional ending meaning if.
Here:

• çıkar = it comes up / it starts
• çıkarsa = if it starts / if it picks up

Turkish often uses the aorist + conditional for general or possible future conditions.

So:

• çıkar = it comes out / it may come out / it tends to come out
• çıkarsa = if it comes out / if it picks up

In English we often say if the wind picks up, not if the wind will pick up. Turkish works similarly here: it does not need a special future form.

So rüzgâr çıkarsa is a very natural way to say if the wind picks up.

Beklerken means while waiting or when waiting.

It comes from beklemek (to wait) plus -ken (while / when).

In this form:

• bekler = waits / is in the habit of waiting
• beklerken = while waiting

So:

dolmuş beklerken = while waiting for the dolmuş

This is a very common Turkish structure:

• gelirken = while coming / while arriving
• yürürken = while walking
• konuşurken = while speaking

A dolmuş is a common form of public transport in Turkey: a shared minibus or sometimes a shared taxi, depending on the place.

It is a cultural word that often stays untranslated in Turkish-learning materials, but in natural English translations you might say:

• minibus
• shared minibus
• shared taxi

So dolmuş beklerken means while waiting for the minibus/shared minibus.

Because in Turkish, an object is often left without the accusative ending when it is non-specific or generic.

So:

• dolmuş beklemek = to wait for a dolmuş / to wait for the minibus in a general sense
• dolmuşu beklemek = to wait for the specific dolmuş

In this sentence, dolmuş is not being singled out as one particular known vehicle. It is more like while waiting for a dolmuş / while waiting for the minibus in a general everyday sense.

That is why dolmuş beklerken sounds natural.

It breaks down like this:

• üşü- = feel cold, get cold
• -yebil- = can / may / be able to
• -sin = you

So üşüyebilirsin literally means you can get cold.

But in context, English usually says:

• you might get cold
• you could get cold

Here -ebil- does not mainly express ability; it expresses possibility.

So the sentence is giving a warning: you might get cold while waiting.

Turkish usually puts background information before the main verb.

The structure here is roughly:

• Hırkanı unutma = Don’t forget your cardigan
• akşam rüzgâr çıkarsa = if the wind picks up in the evening
• dolmuş beklerken = while waiting for the dolmuş
• üşüyebilirsin = you might get cold

So Turkish builds the situation first, then gives the main result at the end.

That makes üşüyebilirsin the final and most important part of the second clause.

Yes, but the meaning changes slightly.

• üşürsün = you get cold / you will get cold / you do get cold
• üşüyebilirsin = you may get cold / you might get cold

So üşüyebilirsin is softer and more cautious. It sounds like a warning about possibility.

That makes it a good choice here, because the speaker is saying: bring your cardigan, because there is a chance you’ll feel cold.