Hava sıcak olduğu için şort giyiyorum.

In Turkish, when the predicate is a noun or adjective, the present-tense is/are is often not said as a separate word.

So:

• Hava sıcak = The weather is hot
• literally, there is no separate is

In this sentence, the idea of being shows up inside olduğu.

Olduğu için is a very common pattern meaning because it is / because it was.

Here:

• sıcak = hot
• olduğu için = because it is

So:

• sıcak olduğu için = because it is hot

It comes from the verb olmak = to be / to become.

It comes from olmak and contains a subordinating form that turns the verb into something like the fact that it is.

A simple learner-friendly breakdown is:

• ol- = verb stem from olmak
• -duğu = a form used in dependent clauses

So olduğu için works like because it is.

You do not need to produce the full technical analysis every time; it is best learned as a common pattern:

• iyi olduğu için = because it is good
• zor olduğu için = because it is difficult
• sıcak olduğu için = because it is hot

Because için does not attach directly to an adjective in this meaning.

Turkish needs a fuller structure to express because it is hot. That is why it uses:

• sıcak olduğu için

not:

• sıcak için

So olduğu is what makes the reason clause work naturally.

It breaks down like this:

• giy- = wear / put on
• -iyor = present continuous / present
• -um = I

So giyiyorum means I am wearing or sometimes I wear.

Because the ending -um in giyiyorum already tells you the subject is I.

So Turkish often leaves out subject pronouns when they are clear from the verb ending.

• giyiyorum = I am wearing
• ben giyiyorum = I am wearing with extra emphasis on I

It can mean either, depending on context.

In this sentence, the most natural reading is:

• I’m wearing shorts because it’s hot

But Turkish -iyor can also sometimes express a general present, especially in context. So it could also be understood more broadly as:

• I wear shorts because it’s hot

Because Turkish often uses the bare singular form for clothing items and generic objects.

So:

• şort giyiyorum naturally means I’m wearing shorts

Even though English uses the plural shorts, Turkish usually just says şort for the item.

If you say şortlar, it sounds more like specific shorts or multiple pairs, depending on context.

Because it is a non-specific direct object here, and Turkish often leaves such objects in the bare form.

So:

• şort giyiyorum = I’m wearing shorts / some shorts
• şortu giyiyorum = I’m wearing the shorts / putting on the specific pair of shorts

The bare object is very natural in this sentence.

Yes. You can say:

• Şort giyiyorum çünkü hava sıcak.

This also means I’m wearing shorts because it’s hot.

The difference is mainly in structure:

• Hava sıcak olduğu için şort giyiyorum. = the reason clause comes first
• Şort giyiyorum çünkü hava sıcak. = the main statement comes first

Both are natural. The olduğu için version feels a bit more built into one sentence, while çünkü is a very straightforward because.

Yes. Turkish word order is flexible.

For example, you can also say:

• Şort giyiyorum, hava sıcak olduğu için.
• Şort giyiyorum çünkü hava sıcak.

But Hava sıcak olduğu için şort giyiyorum is a very natural and standard way to say it.