Hava çok sıcak olunca sahilde serinlemek istiyorum.

Olunca comes from the verb olmak (to be / to become / to happen).

In this sentence, sıcak olunca literally means something like when it becomes hot or when it is hot. In natural English, it often works like:

• when
• once
• since / because (depending on context)

So Hava çok sıcak olunca... can be understood as:

• When the weather is very hot...
• Since the weather is very hot...

Turkish often uses -ınca / -ince / -unca / -ünce to connect events like this.

Both are possible, but they are slightly different.

• hava çok sıcakken = while the weather is very hot / when the weather is hot
• hava çok sıcak olunca = when the weather gets/is very hot, often with a slight sense of as a result or once that situation happens

So olunca often feels a bit more event-like or cause-and-effect:

• Hava çok sıcak olunca sahilde serinlemek istiyorum.
  When/Since the weather is very hot, I want to cool off at the beach.

With -ken, the focus is more on the time/state:

• Hava çok sıcakken sahilde serinlemek istiyorum.
  When the weather is hot, I want to cool off at the beach.

Both are natural, but olunca can sound a little more like because that situation happens.

In Turkish, adjectives often combine with olmak to mean to become / to be in that state.

So:

• sıcak = hot
• sıcak olmak = to be hot / to become hot

Then:

• sıcak olunca = when it is/becomes hot

Even though English just says the weather is hot, Turkish commonly uses adjective + olmak in structures like this.

Sahilde means at the beach or on the beach.

It is made of:

• sahil = coast / shore / beach
• -de = the locative ending, meaning in / at / on

So:

• sahil = beach / shore
• sahilde = at the beach / on the beach

The ending changes by vowel harmony and consonant voicing, so sometimes you see -de, -da, -te, or -ta.

Because serinlemek is a verb meaning to cool off.

• serin = cool (an adjective)
• serinlemek = to become cool / to cool off

In this sentence, the speaker wants to do something, so Turkish uses the infinitive verb:

• serinlemek istiyorum = I want to cool off

You cannot use just serin here, because istemek usually takes a verbal noun/infinitive when you want to say want to do something.

In Turkish, when you want to say want to do something, the second verb is usually put in the infinitive form with -mek / -mak.

So:

• serinlemek = to cool off
• istiyorum = I want

Together:

• serinlemek istiyorum = I want to cool off

Other examples:

• gitmek istiyorum = I want to go
• yemek istiyorum = I want to eat
• uyumak istiyorum = I want to sleep

This is very common in Turkish.

Because Turkish normally puts the main conjugated verb at the end.

The sentence structure is roughly:

• Hava çok sıcak olunca = when the weather is very hot
• sahilde = at the beach
• serinlemek = to cool off
• istiyorum = I want

So the main verb istiyorum comes last, which is standard Turkish word order.

A very literal order would be:

When the weather is very hot, at the beach to cool off I want.

That sounds strange in English, but it is normal in Turkish.

It can suggest either one, depending on context.

In this sentence, olunca most naturally gives a meaning like:

• when the weather is very hot
• since the weather is very hot
• because the weather is very hot

Turkish often leaves this kind of relationship slightly flexible. The context tells you whether the speaker means:

1. a general time situation
   When the weather is hot, I want to cool off at the beach.

2. a reason
   Because the weather is hot, I want to cool off at the beach.

Here, both ideas fit.

Turkish does not have articles like the or a/an.

So:

• hava can mean weather, the weather, or even air, depending on context.

In this sentence, hava clearly means the weather.

Turkish relies on context rather than articles.

Çok sıcak means very hot.

• çok = very / a lot / much
• sıcak = hot

In Turkish, adverbs like çok usually come before the adjective they modify:

• çok güzel = very beautiful
• çok zor = very difficult
• çok sıcak = very hot

So this word order is normal.

Yes, but the meaning changes slightly.

• sahilde = at/on the shore, coast, seaside, beach area
• plajda = at/on the beach in the more specific sense of a beach used for swimming/sunbathing

So:

• sahilde serinlemek istiyorum sounds a bit broader and more natural in many contexts.
• plajda serinlemek istiyorum is also possible, but it points more specifically to the beach itself.

Depending on context, either could work.

Yes, in meaning it is often close to cool myself off, but Turkish expresses it with a simple intransitive verb.

• serinlemek = to cool off
• It does not need a separate word for myself

So:

• sahilde serinlemek istiyorum = I want to cool off at the beach

Turkish often uses a single verb where English might use a verb + reflexive pronoun.

Yes. Hava can mean:

• air
• weather
• sometimes even atmosphere / mood, depending on context

In Hava çok sıcak, it means the weather or the air in a practical sense, but in natural English translation, the weather is very hot is usually best.

Yes. That would also be correct, and it makes the because meaning more explicit.

Compare:

• Hava çok sıcak olunca sahilde serinlemek istiyorum.
  = When/Since the weather is very hot, I want to cool off at the beach.

• Hava çok sıcak olduğu için sahilde serinlemek istiyorum.
  = Because the weather is very hot, I want to cool off at the beach.

So olunca is a bit more flexible, while olduğu için is more clearly causal.

It can be understood either way, depending on context, but most naturally it sounds like a present or general tendency.

• istiyorum is present tense: I want
• So it can mean:
  • Right now, because it’s hot, I want to cool off at the beach
  • or When the weather gets very hot, I want to cool off at the beach

If you wanted to make it clearly habitual, you might say something different depending on context, but this sentence is fine as it is.

Because hava is the subject of the clause.

• Hava çok sıcak = The weather is very hot

Using havanın would put hava in the genitive case, which would require a different structure. So havanın çok sıcak olunca is not the right pattern here.

The plain nominative hava is correct because it is simply the subject of çok sıcak olunca.

You could translate it literally that way, and the grammar is close, but it sounds less natural in English.

A more natural English translation would usually be:

• When the weather is very hot, I want to cool off at the beach.
• or Since the weather is very hot, I want to cool off at the beach.

Literal translations can help you understand the structure, but they are not always the best final translation.