Saya kehujanan dalam perjalanan pulang, jadi saya terus mandi air panas.

Kehujanan means to get caught in the rain or to be rained on, usually unintentionally.

So Saya kehujanan suggests something like:

• I got caught in the rain.
• I was out and ended up getting rained on.

It sounds a bit more specific than just saying I was in the rain. It implies the rain happened to the speaker, often as an unwanted experience.

Because hujan is just the noun or verb idea rain / to rain, while kehujanan is a derived form that means to be affected by rain.

Compare:

• hujan = rain
• kehujanan = to get rained on / get caught in the rain

So Saya hujan would not work here. The speaker is not saying I am rain or I rain. They are saying that rain happened to them.

The ke-...-an pattern often creates a meaning like:

• being affected by something
• experiencing something unintentionally
• suffering or undergoing something

So:

• hujan → kehujanan = to get caught in the rain
• panas → kepanasan = to feel too hot
• dingin/sejuk → kedinginan/kesejukan = to feel cold

In this sentence, kehujanan gives the idea of an accidental experience, not a deliberate action.

Word by word:

• dalam = in / during
• perjalanan = journey / trip
• pulang = to return home / homeward

So dalam perjalanan pulang literally means during the journey home or on the way home.

It is a very natural Malay expression for talking about something that happened while returning home.

Pulang specifically means to go back home / return home. It already contains the idea of going home, so it is more compact.

Compare:

• dalam perjalanan pulang = on the way home
• dalam perjalanan ke rumah = on the way to the house/home

Both can be understood, but pulang sounds more natural when the point is returning home, not just physically going to a house.

Here jadi means so, therefore, or as a result.

It connects the two parts:

• Saya kehujanan dalam perjalanan pulang
• jadi saya terus mandi air panas

So the logic is:

I got caught in the rain on the way home, so I immediately took a hot bath/shower.

In conversation, jadi is very commonly used as a connector like so in English.

In this sentence, terus means immediately, straight away, or directly.

So saya terus mandi air panas means:

• I immediately took a hot bath/shower.
• I went straight to take a hot bath/shower.

It suggests there was no delay and no important action in between.

Mandi is a general word for to bathe / to take a bath / to shower.

The exact English translation depends on context. In modern everyday English, take a shower may often sound more natural, but Malay mandi itself does not always clearly distinguish between bath and shower.

So mandi air panas could be understood as:

• take a hot shower
• take a hot bath
• bathe with hot water

Both are possible, but mandi air panas is very natural and common.

• mandi air panas = bathe/shower using hot water
• mandi dengan air panas = bathe with hot water

Malay often allows this shorter noun pairing without needing dengan.

Similarly, you may see:

• mandi air sejuk = bathe with cold water
• minum air panas = drink hot water / a hot drink

So mandi air panas is a normal, idiomatic expression.

Because there are two clauses, and Malay commonly states the subject again in the second clause for clarity:

• Saya kehujanan...
• jadi saya terus mandi air panas

This is very normal. In English, we also usually repeat the subject:

• I got caught in the rain, so I took a hot shower.

In very casual speech, Malay sometimes drops subjects when they are obvious, but repeating saya here is standard and clear.

Yes, you could, and it would also be understandable.

• Saya kehujanan = I got caught in the rain
• Saya terkena hujan = I got hit by rain / I was exposed to rain

But kehujanan is especially neat and idiomatic for this kind of experience. It often sounds a bit more natural when talking about unexpectedly ending up in the rain.

It is mostly neutral everyday Malay.

Parts like:

• saya
• dalam perjalanan pulang
• jadi
• terus mandi air panas

all sound natural in normal spoken or written Malay.

If you wanted to sound a bit more formal, you might replace jadi with oleh itu or maka, but in ordinary conversation jadi is completely normal.