Ne volim kišu, jer je hladno.

Because volim takes a direct object, and direct objects are usually in the accusative case in Serbian.

• kiša = the dictionary form, nominative singular
• kišu = accusative singular

So:

• Kiša pada. = Rain is falling.
• Volim kišu. = I like rain.
• Ne volim kišu. = I don't like rain.

This is one of the first very common case changes Serbian learners meet.

Serbian often drops subject pronouns when they are already clear from the verb form.

• volim already means I like
• ne volim already means I do not like

So ja is not necessary. You could say Ja ne volim kišu, but that adds emphasis, something like:

• I don’t like rain

In neutral speech, leaving ja out is more natural.

Serbian does not have articles like English the and a/an.

So kiša / kišu can mean:

• rain
• the rain

The exact meaning depends on context. In this sentence, English usually translates it as rain in a general sense: I don’t like rain.

Jer means because.

It introduces the reason:

• Ne volim kišu = I don’t like rain
• jer je hladno = because it is cold

So the whole sentence gives a cause or explanation.

In standard Serbian writing, a comma is normally used before jer when it introduces a reason clause.

So:

• Ne volim kišu, jer je hladno.

That comma is standard and expected in normal written Serbian.

Because hladno here is part of an impersonal expression meaning it is cold.

In weather and general-condition expressions, Serbian often uses the neuter singular form:

• hladno je = it is cold
• toplo je = it is warm
• mračno je = it is dark

This does not mean that hladno is describing a feminine noun like kiša directly. If you wanted to describe rain itself as cold, that would be a different structure.

Je is the 3rd person singular present of biti = to be.

In English, we say it is cold, even though it does not refer to a real thing. Serbian works similarly, but usually without an expressed subject:

• Hladno je. = It is cold.

So je is simply the verb is in this impersonal construction.

Normally, no. It means because it is cold, in the general sense of the weather or temperature.

So the idea is:

• I don’t like rain, because it’s cold.

The coldness is understood as the overall situation, not as a grammatical description of rain itself.

Usually it expresses a general preference: I don’t like rain.

Serbian present tense often works like English present simple in this kind of sentence. So volim / ne volim can mean what someone generally likes or dislikes, not only what they feel at this exact moment.

To some extent, yes. Serbian word order is more flexible than English, but not completely free.

The neutral order here is:

• Ne volim kišu, jer je hladno.

You might also hear variations for emphasis, but the original is the most natural basic version for a learner.

One thing to watch is je: it is a clitic, so it tends to appear in a fixed position near the beginning of its clause. That is why jer je hladno sounds natural.

Yes. Zato što also means because.

So you could say:

• Ne volim kišu, zato što je hladno.

Both are correct. Jer is shorter and very common, while zato što can sound a little more explicit or emphatic depending on context.